Hats do not cause hair loss. Throughout your lifetime, you will lose between 50 and 100 hairs every day. This is nothing to worry about because the body grows new hairs quickly. The average head has 100,000 hairs so if someone loses 100 per day they are only losing 0.01 percent of the total.
There is no scientific evidence that hats cause hair loss and it has never been proven that wearing a hat causes any less or more of a reduction in the amount of hairs lost every day. There are however, some medical conditions such as alopecia, which do cause hair loss and patients do report whether they wear headgear or not. There is no connection between the two and no medical evidence to support a link exists.
One reason people do think hats cause hair loss may be due to traction alopecia, which can result from too much tension or pulling on the hair for an extended period of time. Traction alopecia most commonly occurs in African-American men who do not regularly wear their hair in an up do, but wear it closely cut to the scalp with a close-fitted cap or do rag.
Wearing hats is good for your hair because air helps your hair naturally dry after washing and prevents tangles. Natural oils also coat your hair shafts when you do not