On October 3, 2023, South Lhonak Lake in Sikkim burst. A wall of water tore down the Teesta. 55 dead, dozens more never found. But the image that stayed on front pages for two days - a young man in Treesta Bazaar who lost his house, his insulin, and his mother's medical records - told the real disaster.
Shashank R Joshi, endocrinologist and public health physician, argues we have framed glacier retreat as a climate change story. After the latest disaster in Nepal, it needs to be framed as a health systems collapse.
He divides it into Four Waves. Wave One is the immediate kill: drowning, trauma, hypothermia. Kedarnath 2013, Chamoli 2021, Sikkim 2023 - deaths were counted, injuries were not.
Wave Two is the toxic soup: Glacial flood is not just water. It is silt plus sewage plus animal carcasses plus industrial waste. A laboratory for diarrhoea, hepatitis A and E, typhoid, skin infections, leptospirosis. When primary health centres go under, a pregnant woman delivers on the roadside. Vaccines warm. Outbreaks begin after the rescue teams leave.
Wave Three is the invisible disruption, and the largest: the severing of the drug chain. Himalayan states carry a heavy load of non-communicable disease. When a disaster snaps the cold chain and supply route, insulin needs refrigeration, electricity may be out for weeks, dialysis patients are forced onto journeys of hundreds of kilometres, tuberculosis treatment is interrupted.
Wave Four is the long shadow: After Sikkim, clinicians reported old patients relapsing and new ones arriving with panic, hyperarousal and inability to sleep when rain begins. Children stop going to school. Farmers watch a field turn into a stone bed.
In wetlands, the flood leaves behind mosquitoes at altitudes where they were never a public health concern. The glacier redraws disease ecology.
Joshi's prescription is structural. First, map the downstream health footprint. ISRO and NDMA must make that map shareable with Health and Family Welfare data: primary health centres, sub-centres, cold-chain points, antenatal caseloads, insulin-dependent patients, dialysis chairs. Second, treat early warning as clinical intervention - to lift an oxygen plant, move vaccines, shift workforce, and lock the NCD cupboard onto higher ground. Third, make the hill hospital climate-proof.
The National Programme on Climate Change and Human Health must name glacier-related disasters as a separate hazard for Himalayan districts. Every district hospital in those catchments needs elevated drug storage, a solar-backed cold chain, a seven-day emergency kit for hypertension, diabetes, asthma and mental health, and household safe-water stock.
Watch for 90 days, not 90 hours. Post-disaster, surveillance should look for diarrhoeal syndromes, jaundice, wound infections, breathlessness, distress and new-onset fever where vectors have new water.
The next glacier tragedy will ask whether anyone counted the insulin, the dialysis chair, the labour room and the child who still startles when the river rises in a dream.