A, wet hair to sleep to hair gray Ms. Liu is 25 years old, is a company of ordinary employees, recently Ms. Liu suddenly found a lot of gray hair on the head, which makes the young Ms. Liu very worried, so Ms. Liu went to the hospital to ask the doctor the reason for long gray hair, the doctor explained after careful inquiry and examination, Ms. Liu “gray hair” of The main reason is that she sleeps with wet hair at night. As a result of washing hair before bedtime hair attached to water and water vapor, out of the bathroom, the temperature of other rooms to significantly lower than the bathroom, hair on the water and water vapor to evaporate and condensation will take away a lot of heat, hair and scalp in a cold state, which makes the line of hair pigment cells of the hair bulb metabolism is affected, reducing the ability to secrete melanin, hair melanin reduction will of course trigger the gradual graying of hair. Second, wet hair sleep easy to catch a cold Ms. Wang is 23 years old, after graduating as a village official, Ms. Wang liked to read a book to run two laps on the playground when she was in college, and then back to the dormitory after a hot shower sleep habits, and has continued until now. However, in recent years, Ms. Wang has frequent colds, and more times than not, she also has allergic rhinitis. For this reason, Ms. Wang consulted with her doctor. After listening to Ms. Wang’s medical history, the doctor analyzed that, before going to bed with hot water to wash the hair, the scalp and respiratory capillary expansion, sweat hair expansion, after the bathroom by the stimulation of external low temperature, evaporation of water on the hair and head moisture will take away a lot of heat, the opening of the sweat glands will contract tightly closed, the body to excrete metabolites due to the occlusion of the sweat gland mouth can not be discharged stagnant in the body, and bring the cold into the The body and respiratory tract, triggering the contraction of capillaries in the scalp and respiratory mucous membrane tract, the local blood flow is reduced, resistance is reduced, viruses and bacteria will take advantage of the situation, there will be cold, nasal congestion, nasal congestion, joint soreness, headache, fever, etc.. Third, wet hair to sleep can induce a variety of diseases “I always have a headache recently, whenever the headache up particularly strong, less than 3-5 days, more than 10 days and a half, pick up affect life and work, ask the doctor to know that the original cause of the occurrence and my wet hair to sleep triggered myotonic headache.” Ms. Gu introduced to the reporter. Medical experts said to reporters: “Not only can trigger a cold and gray hair, but also trigger headache, dizziness, limb numbness, weakness, crooked mouth, coughing, spitting, fever and other symptoms, but also can cause other serious diseases. Wash your hair before bedtime wet hair bedtime often triggers diseases in addition to the above-mentioned diseases, but also cervical spondylosis, shoulder arthritis, neuritis, occipital neuralgia, supraorbital neuralgia, idiopathic facial neuritis, Hunter syndrome, bronchitis, bronchial asthma and pneumonia and other diseases. How to prevent diseases caused by wet hair sleeping? 1, try to avoid washing hair and bathing before going to bed; 2, after washing hair and bathing to dry hair with a hair dryer, no sweat on the body before going out of the bathroom, and pay attention to warmth, avoid blowing cold wind and cold; 3, diligent combing hair, 5-10 minutes each time, often do scalp massage to enhance the ability to resist cold.