Monsoon And Diabetes: Why Infection Risk Increases During The Rainy Season

Thursday, September 17, 2026, 17:33

The first heavy showers of the season usually bring relief from the heat. For someone living with diabetes, they can also bring something less welcome: an itch between the toes that won't go away, a small cut that takes twice as long to heal, or a urinary infection that seems to return every few weeks. None of this is a coincidence. High blood sugar and monsoon weather work against the body in the same direction, and the overlap shows up in hospital OPDs across India every year once the rains set in.

Photo Credit: Sun Pharma

Understanding why infection risk increases during the rainy season matters more in India than almost anywhere else, given how large the country's diabetes burden already is, and how much of the monsoon is spent in damp shoes, humid air, and standing water.

Gyaan by Ganesh - Making India Win Over Diabetes is an awareness initiative by Sun Pharma, in partnership with the American Diabetes Association, focused on helping Indians better understand, prevent, and manage diabetes through expert-backed information.

A Two-Front Problem: A Weaker Defence, A Friendlier Enemy

To understand why monsoon hits people with diabetes harder, it helps to separate two things that happen at once: the body's ability to fight infection goes down, while the environment's ability to cause one goes up.

The Immune System Runs On Low Power

Neutrophils are the white blood cells that act as the body's first responders, rushing to an infection site to engulf and destroy bacteria and fungi before they spread. In a body running on consistently high blood sugar, this response slows down at almost every stage.

A review published in Frontiers in Immunology found that persistent hyperglycaemia impairs neutrophils' ability to migrate towards an infection, recognise the pathogen, and kill it once engulfed - a chain of failures that applies to both Type 1 and Type 2 diabetes.

The same research notes that people with diabetes face close to double the risk of urinary tract infections, a 1.5-fold higher risk of surgical site infections, and two to three times the risk of bacteraemia (bacteria in the bloodstream) compared with people who do not have the condition.

Sugar In The Urine Is Sugar For Bacteria

Diabetes affects infection risk through a second, more direct route: glycosuria, or glucose spilling into the urine once blood sugar exceeds what the kidneys can reabsorb. Research published in the journal mSphere found that this excess urinary glucose doesn't just sit passively - it actively changes the behaviour of E. coli, the bacteria responsible for roughly 80 percent of urinary tract infections, making the bacteria more likely to form biofilms and colonise the urinary tract. Separate research in the Journal of Clinical Investigation has shown that insulin itself plays a role in the kidney's antibacterial defences, meaning impaired insulin signalling - the hallmark of diabetes - can weaken this protection independently of blood sugar levels alone.

Put simply: diabetes creates an environment bacteria find easier to colonise, at the exact moment the immune system is least equipped to clear them out.

What This Looks Like During Monsoon

Rain does not cause infections on its own. It creates the exact conditions fungi and bacteria need to thrive - warmth, humidity, and prolonged contact with wet skin - layered on top of a body that is already compromised. In practice, this shows up in a few recurring ways each monsoon.

Fungal skin infections: Athlete's foot, ringworm, and jock itch become far more common once footwear and clothing stay damp for hours. Elevated glucose levels in sweat and skin secretions give fungi an additional growth advantage, which is why dermatologists consistently list diabetes as a risk factor for recurrent or stubborn fungal infections during the rainy season.
Diabetic foot complications: This is the most serious of the monsoon risks. Nerve damage from long-term high blood sugar (neuropathy) means many people don't feel small cuts, blisters, or abrasions picked up while wading through flooded streets. Combined with poor circulation and a slower immune response, an unnoticed wound can progress to an ulcer within days, and an ulcer left untreated can progress to infection, and in severe cases, gangrene.
Urinary tract infections: As outlined above, glycosuria and immune dysfunction combine to make UTIs both more frequent and more likely to ascend into the kidneys in people with diabetes - a complication called pyelonephritis that requires more aggressive treatment.
Rare but serious fungal complications: In cases of very poorly controlled diabetes, particularly when blood sugar spikes alongside another illness, the risk extends to invasive fungal infections such as mucormycosis - the infection that drew national attention during India's COVID-19 wave, where uncontrolled diabetes was one of the most significant risk factors identified.

"High blood sugar essentially blindfolds the immune system. Bacteria and fungi that a healthy body would clear within days can linger for weeks in someone with poorly controlled diabetes - and monsoon just gives them more opportunities to get in," explained Dr Saurav Das, Consultant Endocrinologist and Diabetologist, Apollo International Hospital, Guwahati.

Photo Credit: Sun Pharma

Reducing The Risk Through The Rainy Season

None of this means monsoon has to be spent indoors. It means a few habits become non-negotiable for the season:

Dry your feet thoroughly, especially between the toes, every single time they get wet
Avoid wearing the same damp shoes on consecutive days. Rotate footwear so it dries out fully between uses
Check your feet daily, particularly the soles and between the toes, for cuts, blisters, or discolouration, especially if you have any loss of sensation
Treat even minor cuts, cracks, or fungal patches promptly rather than waiting to see if they resolve on their own Keep blood sugar as close to target range as possible, since glucose control has a direct bearing on how well the body fights off infection
Stay hydrated and avoid holding urine for long periods, which gives bacteria more time to multiply
Avoid walking barefoot through puddles or standing water where possible

When To See A Doctor Immediately

Certain signs should never wait out the rains: a wound that is warm, swollen, or producing discharge; a fever alongside any skin or urinary symptom; a foot injury that hasn't started healing within a few days; or pain, burning, or blood while urinating. In diabetes, infections that seem minor at first can escalate faster than they would in someone without the condition, which is exactly why early attention matters more, not less.

Monsoon does not create new risks for people with diabetes so much as it exposes ones that are already there. A weakened immune response, glucose-friendly conditions for bacteria, and reduced foot sensation form a combination that rewards vigilance and punishes neglect. Checking your feet, watching your sugar, and treating small problems early through the rainy season is not overcaution; for many people with diabetes, it is what keeps a minor infection from becoming a major one.

[Disclaimer: This material is for patient education/awareness purpose only. It does not replace the advice or counsel of a doctor or health care professional. Sun Pharmaceuticals Laboratories Limited (SPLL) makes every effort to provide information that is accurate and timely, but makes no guarantee in this regard. You should consult with, and rely only on the advice of, your physician or health care professional. No part of this may be reproduced, transmitted or stored in any form or by any means either mechanically or electronically without prior intimation to Sun Pharmaceuticals Laboratories Limited (SPLL). SPI-IN-CVD-ZT---08-20260303]

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Article Published On: Thursday, September 17, 2026, 17:33 [IST]

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