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But as elite and amateur runners alike prepare for 26.2 miles through Greenwich, Tower Bridge, and down The Mall, one question matters more than pace targets: what are the genuine health risks on race day, and when should a runner — or a spectator — seek immediate medical help?\n\n## The Scale of London Marathon Medical Operations\n\nThe London Marathon deploys more than 1,000 St John Ambulance volunteers on race day, alongside doctors, physiotherapists, and podiatrists stationed at first aid points along the entire 26.2-mile course. Medical personnel are positioned at water stations, at every major bridge crossing, and at the finish line.\n\nThis infrastructure exists for good reason. According to research published in the Sports Performance Bulletin, the incidence of sudden cardiac death in mass-participation marathons is between 0.6 and 1.9 deaths per 100,000 participants — a small but real risk that organisers take seriously. For the 50,000+ runners taking part in London on 27 April, this data translates into a clear message: preparation before the race is as important as medical support during it.\n\nSifan Hassan — the Olympic champion and 2023 London Marathon winner — withdrew from the 2026 race after suffering an [Achilles tendon injury](\u002Fgb\u002Fnews\u002Flondon-marathon-2026-training-injuries-sports-medicine) during treadmill training six weeks before the event. Her withdrawal is a reminder that even elite athletes are not immune to the physical toll of marathon preparation, and that recognising the early signs of injury or health problems is critical.\n\n## The Most Common Race-Day Medical Emergencies\n\n### Hyponatremia: The Hidden Risk of Overhydration\n\nHyponatremia — low blood sodium caused by drinking too much water — is one of the most underestimated risks in distance running. It occurs when runners drink excessive volumes of plain water without replacing electrolytes, diluting sodium levels in the blood.\n\nSymptoms include nausea, headache, confusion, and in severe cases, seizures or loss of consciousness. The condition can be life-threatening and is more common among slower runners who spend longer on the course and drink more per kilometre covered.\n\nThe guidance from sports medicine specialists is clear: drink to thirst, not to schedule. Taking on an electrolyte sports drink rather than water alone — particularly from mile 10 onwards — significantly reduces the risk.\n\n### Cardiac Events: Who Is Most at Risk?\n\nSudden cardiac arrest during a marathon typically affects runners with previously undiagnosed heart conditions — most commonly hypertrophic cardiomyopathy or coronary artery disease. The risk is highest in male runners over 40 who have not had a pre-race cardiac screening.\n\nWarning signs that demand immediate [medical attention](\u002Fgb\u002Fnews\u002Fbrighton-marathon-2026-running-injuries-sports-doctor) include:\n- Chest pain or pressure, even if mild\n- Dizziness or light-headedness that does not resolve with slowing down\n- Palpitations or an unusually irregular heartbeat\n- Extreme breathlessness disproportionate to effort level\n- Loss of consciousness, however briefly\n\nIf you witness another runner collapse, call 999 immediately. Defibrillators (AEDs) are stationed throughout the London Marathon course and at the finish line.\n\n### Muscle Cramps, Blisters, and Heat Exhaustion\n\nMore commonly, race-day medical tents treat:\n\n- **Muscle cramps**: Usually caused by dehydration and electrolyte loss; respond to stretching, rest, and fluid replacement\n- **Blisters and skin chafing**: Preventable with correct sock choice, body glide, and properly fitted shoes broken in before race day\n- **Heat exhaustion**: Characterised by heavy sweating, pale skin, fast pulse, and nausea; requires immediate cooling, shade, and medical assessment\n\nThe [NHS guidance on heat exhaustion](https:\u002F\u002Fwww.nhs.uk\u002Fconditions\u002Fheat-exhaustion-heatstroke\u002F) advises that anyone showing signs of heat exhaustion should stop activity immediately, move to a cool place, and if symptoms do not improve within 30 minutes, call 999.\n\n## When Should Runners See a Doctor Before Race Day?\n\nEvery year, runners attempt London with conditions they have not had professionally assessed. If any of the following apply, a pre-race consultation with a GP or sports medicine doctor is recommended before 27 April:\n\n1. **Chest pain or breathlessness during recent training runs** — even if mild and transient\n2. **A previously diagnosed heart condition** — including hypertension or arrhythmia\n3. **Knee, hip, or Achilles pain that has worsened in the final four weeks of training** — running through a stress fracture or tendon tear can cause lasting damage\n4. **Unusual swelling in one leg during training** — this can indicate deep vein thrombosis, which carries a risk of pulmonary embolism post-race\n5. **A recent illness within two weeks of race day** — particularly any viral infection, which temporarily affects cardiac function\n\nSports medicine specialists and GPs are experienced in evaluating runners' pre-race concerns. A brief consultation can identify whether a condition can be managed safely on race day, or whether deferring entry to 2027 is the medically sound choice.\n\n## After the Race: Recovery and When to Seek Help\n\nThe hours and days after a marathon are a critical recovery window. Post-race, it is normal to experience muscle soreness, fatigue, and reduced immunity. However, certain symptoms require medical assessment:\n\n- **Swelling or pain in one calf or thigh** 24-48 hours after the race — DVT risk remains elevated for several days post-marathon\n- **Dark or reduced urine output** — can indicate rhabdomyolysis, a breakdown of muscle tissue that can damage the kidneys\n- **Persistent chest pain or breathlessness** beyond the first 30 minutes of finishing\n- **Fever above 38°C** within 48 hours — immune suppression after a marathon can allow infections to take hold quickly\n\nThe excitement of completing the London Marathon — whether in 2:15 or 5:30 — is one of the great sporting experiences available to ordinary people. But the reward of crossing that finish line on The Mall depends on getting to the start line healthy and racing within your limits.\n\nWith 1.1 million people competing for a London Marathon ballot place in 2026, this event matters deeply to hundreds of thousands of UK runners. Giving your health the same priority as your training schedule is the most important step you can take before 27 April.\n\n> **Disclaimer:** This article provides general health information for runners preparing for the London Marathon. It does not constitute medical advice. Consult your GP or a qualified sports medicine professional for personalised guidance.\n","https:\u002F\u002Fpub-bdebbd2dad294475a2da0eb657815b6b.r2.dev\u002Fhero\u002Ffbad36e40650-d9ff50.webp","Runners taking part in the London Marathon on a crowded city street","{\"author\": \"Chmee2\", \"source\": \"wikimedia\", \"license\": \"CC BY-SA 3.0\", \"pageUrl\": \"https:\u002F\u002Fcommons.wikimedia.org\u002Fwiki\u002FFile:Runners_of_the_2013_London_Marathon_(3).JPG\", \"attributionHtml\": \"Photo: Chmee2 \u002F Wikimedia (CC BY-SA 3.0)\"}",null,5,"PUBLISHED","en-GB","gb","en","cmkzhjvvl00wzwf4f2r5r541y","a9c320bb-8892-4df9-9216-dcecffa3b2f4","London Marathon 2026: Key Health Risks & When to See a Doctor | Expert Zoom","The London Marathon 2026 is on 27 April. Know the real race-day health risks — cardiac events, hyponatremia, heat exhaustion — and when to seek medical help.","london marathon 2026 health risks medical advice runners","london marathon","GB","fbad36e40650","9cc87197-5408-43dc-9de5-d740868a64f4",1121,2,"NEUTRAL","Crawled - currently not indexed","2026-04-11T10:30:17.000Z","2026-07-01T07:31:23.717Z",2.7,"needs_improvement",1.35,"good",0,"2026-05-29T10:55:48.040Z","2026-04-11T08:05:02.569Z","2026-04-11T08:05:02.570Z","2026-07-28T10:53:45.979Z",{"id":1043,"name":674,"slug":676,"parentId":1037},{"id":1044,"first_name":1069,"name":1070,"slug":1071,"specialty":1072,"picture":1073,"region":1074},"Rebecca","Taylor","rebecca-taylor","Health Advisor","expertPics\u002Fdoctors\u002Fdoctors-expert-1775228707267.webp",{"code":1040,"country":1075},{"code":1049,"name":1076},"Royaume-Uni","\u003Cp>The 2026 TCS London Marathon takes place on Sunday, 27 April — and with a record 1,133,813 people entering the ballot this year, it is one of the most eagerly anticipated sporting events in the UK calendar. But as elite and amateur runners alike prepare for 26.2 miles through Greenwich, Tower Bridge, and down The Mall, one question matters more than pace targets: what are the genuine health risks on race day, and when should a runner — or a spectator — seek immediate medical help?\u003C\u002Fp>\n\u003Ch2 id=\"the-scale-of-london-marathon-medical-operations\">The Scale of London Marathon Medical Operations\u003C\u002Fh2>\n\u003Cp>The London Marathon deploys more than 1,000 St John Ambulance volunteers on race day, alongside doctors, physiotherapists, and podiatrists stationed at first aid points along the entire 26.2-mile course. Medical personnel are positioned at water stations, at every major bridge crossing, and at the finish line.\u003C\u002Fp>\n\u003Cp>This infrastructure exists for good reason. According to research published in the Sports Performance Bulletin, the incidence of sudden cardiac death in mass-participation marathons is between 0.6 and 1.9 deaths per 100,000 participants — a small but real risk that organisers take seriously. For the 50,000+ runners taking part in London on 27 April, this data translates into a clear message: preparation before the race is as important as medical support during it.\u003C\u002Fp>\n\u003Cp>Sifan Hassan — the Olympic champion and 2023 London Marathon winner — withdrew from the 2026 race after suffering an \u003Ca href=\"\u002Fgb\u002Fnews\u002Flondon-marathon-2026-training-injuries-sports-medicine\">Achilles tendon injury\u003C\u002Fa> during treadmill training six weeks before the event. Her withdrawal is a reminder that even elite athletes are not immune to the physical toll of marathon preparation, and that recognising the early signs of injury or health problems is critical.\u003C\u002Fp>\n\u003Ch2 id=\"the-most-common-race-day-medical-emergencies\">The Most Common Race-Day Medical Emergencies\u003C\u002Fh2>\n\u003Ch3 id=\"hyponatremia-the-hidden-risk-of-overhydration\">Hyponatremia: The Hidden Risk of Overhydration\u003C\u002Fh3>\n\u003Cp>Hyponatremia — low blood sodium caused by drinking too much water — is one of the most underestimated risks in distance running. It occurs when runners drink excessive volumes of plain water without replacing electrolytes, diluting sodium levels in the blood.\u003C\u002Fp>\n\u003Cp>Symptoms include nausea, headache, confusion, and in severe cases, seizures or loss of consciousness. The condition can be life-threatening and is more common among slower runners who spend longer on the course and drink more per kilometre covered.\u003C\u002Fp>\n\u003Cp>The guidance from sports medicine specialists is clear: drink to thirst, not to schedule. Taking on an electrolyte sports drink rather than water alone — particularly from mile 10 onwards — significantly reduces the risk.\u003C\u002Fp>\n\u003Ch3 id=\"cardiac-events-who-is-most-at-risk\">Cardiac Events: Who Is Most at Risk?\u003C\u002Fh3>\n\u003Cp>Sudden cardiac arrest during a marathon typically affects runners with previously undiagnosed heart conditions — most commonly hypertrophic cardiomyopathy or coronary artery disease. The risk is highest in male runners over 40 who have not had a pre-race cardiac screening.\u003C\u002Fp>\n\u003Cp>Warning signs that demand immediate \u003Ca href=\"\u002Fgb\u002Fnews\u002Fbrighton-marathon-2026-running-injuries-sports-doctor\">medical attention\u003C\u002Fa> include:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Chest pain or pressure, even if mild\u003C\u002Fli>\n\u003Cli>Dizziness or light-headedness that does not resolve with slowing down\u003C\u002Fli>\n\u003Cli>Palpitations or an unusually irregular heartbeat\u003C\u002Fli>\n\u003Cli>Extreme breathlessness disproportionate to effort level\u003C\u002Fli>\n\u003Cli>Loss of consciousness, however briefly\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If you witness another runner collapse, call 999 immediately. Defibrillators (AEDs) are stationed throughout the London Marathon course and at the finish line.\u003C\u002Fp>\n\u003Ch3 id=\"muscle-cramps-blisters-and-heat-exhaustion\">Muscle Cramps, Blisters, and Heat Exhaustion\u003C\u002Fh3>\n\u003Cp>More commonly, race-day medical tents treat:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Muscle cramps\u003C\u002Fstrong>: Usually caused by dehydration and electrolyte loss; respond to stretching, rest, and fluid replacement\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Blisters and skin chafing\u003C\u002Fstrong>: Preventable with correct sock choice, body glide, and properly fitted shoes broken in before race day\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Heat exhaustion\u003C\u002Fstrong>: Characterised by heavy sweating, pale skin, fast pulse, and nausea; requires immediate cooling, shade, and medical assessment\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The \u003Ca href=\"https:\u002F\u002Fwww.nhs.uk\u002Fconditions\u002Fheat-exhaustion-heatstroke\u002F\">NHS guidance on heat exhaustion\u003C\u002Fa> advises that anyone showing signs of heat exhaustion should stop activity immediately, move to a cool place, and if symptoms do not improve within 30 minutes, call 999.\u003C\u002Fp>\n\u003Ch2 id=\"when-should-runners-see-a-doctor-before-race-day\">When Should Runners See a Doctor Before Race Day?\u003C\u002Fh2>\n\u003Cp>Every year, runners attempt London with conditions they have not had professionally assessed. If any of the following apply, a pre-race consultation with a GP or sports medicine doctor is recommended before 27 April:\u003C\u002Fp>\n\u003Col>\n\u003Cli>\u003Cstrong>Chest pain or breathlessness during recent training runs\u003C\u002Fstrong> — even if mild and transient\u003C\u002Fli>\n\u003Cli>\u003Cstrong>A previously diagnosed heart condition\u003C\u002Fstrong> — including hypertension or arrhythmia\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Knee, hip, or Achilles pain that has worsened in the final four weeks of training\u003C\u002Fstrong> — running through a stress fracture or tendon tear can cause lasting damage\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Unusual swelling in one leg during training\u003C\u002Fstrong> — this can indicate deep vein thrombosis, which carries a risk of pulmonary embolism post-race\u003C\u002Fli>\n\u003Cli>\u003Cstrong>A recent illness within two weeks of race day\u003C\u002Fstrong> — particularly any viral infection, which temporarily affects cardiac function\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cp>Sports medicine specialists and GPs are experienced in evaluating runners' pre-race concerns. A brief consultation can identify whether a condition can be managed safely on race day, or whether deferring entry to 2027 is the medically sound choice.\u003C\u002Fp>\n\u003Ch2 id=\"after-the-race-recovery-and-when-to-seek-help\">After the Race: Recovery and When to Seek Help\u003C\u002Fh2>\n\u003Cp>The hours and days after a marathon are a critical recovery window. Post-race, it is normal to experience muscle soreness, fatigue, and reduced immunity. However, certain symptoms require medical assessment:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Swelling or pain in one calf or thigh\u003C\u002Fstrong> 24-48 hours after the race — DVT risk remains elevated for several days post-marathon\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Dark or reduced urine output\u003C\u002Fstrong> — can indicate rhabdomyolysis, a breakdown of muscle tissue that can damage the kidneys\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Persistent chest pain or breathlessness\u003C\u002Fstrong> beyond the first 30 minutes of finishing\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Fever above 38°C\u003C\u002Fstrong> within 48 hours — immune suppression after a marathon can allow infections to take hold quickly\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The excitement of completing the London Marathon — whether in 2:15 or 5:30 — is one of the great sporting experiences available to ordinary people. But the reward of crossing that finish line on The Mall depends on getting to the start line healthy and racing within your limits.\u003C\u002Fp>\n\u003Cp>With 1.1 million people competing for a London Marathon ballot place in 2026, this event matters deeply to hundreds of thousands of UK runners. Giving your health the same priority as your training schedule is the most important step you can take before 27 April.\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>Disclaimer:\u003C\u002Fstrong> This article provides general health information for runners preparing for the London Marathon. It does not constitute medical advice. Consult your GP or a qualified sports medicine professional for personalised guidance.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n",{},[]]