Common causes of excessive hair loss during summer season Hair loss in summer can occur due to a variety of factors. Here are the six most common reasons why so many men and women experience excessive hair loss during summer season: Increased exposure to sunlight During summer, we spend more time outdoors, exposing our hair to the sun's ultraviolet (UV) rays. Excessive UV exposure can damage the hair cuticle, making it weak and brittle, leading to hair loss. Heat and humidity High temperatures and humidity levels can cause the scalp to become excessively sweaty and oily. This can lead to scalp inflammation, clogged hair follicles, and ultimately result in hair loss. Seasonal shedding Some individuals experience seasonal hair shedding, commonly known as telogen effluvium. This shedding occurs due to changes in the hair growth cycle, and it is believed to be influenced by factors such as changes in daylight duration and hormone fluctuations. Summer can trigger this shedding process