Mumbai’s Searing Heat Leaves a Distinct Mark on Blood and Urine Tests, Study Finds Mumbai’s summer heat appears to impact residents’ health in ways distinct from other Indian cities, according to a study conducted by Plum Health Insurance.
The analysis examined routine health check-up data from 1,382 patients in the Mumbai metropolitan region, including Thane and Navi Mumbai, comparing results from the summer months of April-May 2026 with those from the winter period of November 2025-February 2026.
Unlike the dehydration patterns typically observed in hot and dry regions, Mumbai’s summer signals were marked by a rise in acidic urine, low iron levels, and lower haematocrit — a measure of red blood cell concentration.
Specifically, the share of patients with acidic urine increased by 32 percent, low iron levels rose by 63 percent, and low haematocrit went up by 38 percent during summer. Surprisingly, concentrated urine, a common dehydration marker, fell by 9 percent during the same period.
The findings suggest that Mumbai’s humid coastal climate triggers physiological responses different from those seen in inland cities.
“Mumbai’s summer signal is more about acidic urine and blood markers such as iron and haematocrit than concentrated urine, consistent with humid-heat stress rather than classic dry dehydration,” the report stated.
The study also highlighted contrasting patterns in neighbouring Pune, where summer did not produce clear dehydration signals.
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