Why Are UTIs More Common in Summer?

TDT | Manama

Email: mail@newsofbahrain.com

Summer means travel, sunshine, and outdoor fun - but it also brings an unexpected rise in urinary tract infections (UTIs), and the cause is often misunderstood.

According to urologist Dr Mahmoud Sharaf, the issue is not stronger bacterial growth, as one might think, but a mix of environmental factors and daily habits that leave the urinary system more vulnerable.

UTIs occur when bacteria enter the urinary tract, causing symptoms such as burning during urination, frequent urges to urinate, and lower abdominal discomfort.

As the doctor explains, it is a simple cycle between the invading organism, the urinary system (the host), and the resulting symptoms.

Speaking to TDT, Dr Mahmoud said, “Urine acts like a flowing river that helps flush bacteria out,” adding that when this natural flow slows, the risk of infection increases.

 “UTIs in summer are largely environmental and behavioral rather than purely pathological.”

“Higher temperatures lead to increased fluid loss through sweating and breathing, often resulting in dehydration. This reduces urine volume and flow - the body’s primary defense against urinary infections. At the same time, concentrated urine can irritate the bladder lining, making it easier for bacteria to attach and multiply.”

Heat and humidity also encourage bacterial growth around the genital area, especially in women, where moisture from sweating can increase colonization, added Dr Mahmoud.

Prevention

Speaking about reducing the risk of UTIs this summer, he advises maintaining regular hydration of around 2–3 litres of water daily, rather than waiting for thirst. The bladder, he notes, should not be treated as a storage tank but as a flushing system, so urine should not be held and should be passed every 3–4 hours. During travel, he recommends using the cleanest available restrooms, avoiding prolonged wear of wet clothing such as swimwear and opting for breathable fabrics such as cotton.

“The fact is that Cranberry is for prevention and the myth is that Cranberry is for cure. Cranberry juice contains proanthocyanidins, which form a protective lining on the urinary bladder mucosa, reducing bacterial adhesion.”

“Your best natural antibiotics in summer to avoid UTI are hydration, urine flow and hygiene.”, he said. 

Globally, UTIs are a major health burden, with an estimated 400 - 450 million cases annually. They are far more common in females, with women being about 3.6 times more affected than men, and the risk increases after menopause. Around 50–60% of women experience at least one UTI in their lifetime, compared to 12–14% of men.