Oily scalp in summer Causes of oily hair 💇 W ash hair too often Whether the scalp is greasy or not depends on the secretion of the body's sebaceous glands. The secretion of sebaceous glands is affected in many ways, such as diet, endocrine, mood, work and rest, etc. Therefore, hair prones to produce oil, most of which are related to personal living habits. Many people with oily skin also have very oily hair. Greasy hair can make people feel uncomfortable, and only a few hours after washing the hair, the hair will feel refreshed, so many people will increase the frequency of washing their hair. In fact, washing too often can also cause greasy scalp, because if you wash it every day, it will wash off the oil on the surface of the scalp, resulting in imbalance of water and oil, and the oil glands will secrete more oil, causing the scalp to become more and more oily. The most reasonable time for shampooing should be 48 hours apart. Friends who get oily too quickly can keep it onc