Some people often wash their hair with cold water in order to get the cool pleasure of cold water, and some people need to work overtime, in order to drive away drowsiness, also used to wash the head with cold water to refresh. Although washing your hair with cold water can achieve the purpose of temporarily eliminating heat and driving away drowsiness, but at the same time it can also bring great harm to people’s health. Experts say that if you wash your hair with cold water for a long time, you may suffer from neurological headaches. Why does washing your hair with cold water for a long time cause neurological headaches? The scalp is one of the most nerve-rich areas, and it is the closest to the brain in one line. When the nerves are stimulated, they react: excitation, or inhibition. But when excitation and inhibition exceed a certain limit, it can cause nerve dysfunction and lead to disease, mainly in the form of neuropathic headache. Neurological headache is divided into three main categories: functional headache, vascular headache and tension headache. When cold water is used to wash hair, the stimulation of scalp tension can cause tension headache. At the same time, cold water makes the capillaries of the scalp suddenly constrict and the blood pressure then rises, and the arterial vessels of the brain are very sensitive to pain, thus triggering vascular headache. Tension headache and vascular headache are added together to form a mixed headache. Most of the patients mainly have persistent headaches on both sides for years and years. What are the other hazards of washing hair with cold water for a long time? 1.It is easy to cause vascular dysfunction: In the hot season, the head is easy to sweat after exercise and work, when the blood vessels are in the dilated state, if rinsing with cold water, the cold stimulation will force to contract the blood vessels, which may cause abnormal intracranial vascular function, thus inducing dizziness, black eyes and vomiting, and in serious cases, it may also cause intracranial hemorrhage. 2.It will lead to other serious symptoms: If you wash your hair with cold water every day for a long time, besides the headache pain will escalate, it will also be accompanied by dizziness, irritability, anxiety, panic, shortness of breath, fear, tinnitus, insomnia and dreaminess, back pain, stiff neck, etc. Some patients have obvious pressure pain points on both sides of the neck and occiput. There is even the possibility of thrombotic attacks due to the fierce constriction of cerebral blood vessels. How to prevent neuropathic headache? 1.For healthy people, it is not advisable to wash hair with cold water for a long time. Cerebrovascular patients should be more careful not to use cold water to wash their hair. Summer cooling refreshment, you can drink a cup of coffee or use a towel dipped in some hot water on the face, the effect is also good, there is no harm to the body. 2, eat less 3C food: the so-called 3C food is cheese cheese, citrus food, chocolate, and marinated sardines, chicken liver, tomatoes, milk, lactic acid drinks and other foods rich in tyramine. And tyramine is the main cause of vascular spasm, so if you have a history of migraine, then it is best to stay away from these foods. 3, eat less smoked food: sausages, hot dogs, ham, bacon and other cured and smoked meats, processed meats and other foods containing nitrites, as well as foods containing MSG will harm you migraine, it is best to eat as little as possible in daily life. 4, take food containing magnesium: magnesium can regulate blood flow, relax the muscles. For some people, even if only a little magnesium deficiency, can trigger a headache. 5, the use of painkillers need to be careful: painkillers can be a tempting trap. Many people take painkillers privately in an attempt to reduce pain, but overdose of painkillers, not only can not relieve the pain, but on the contrary will cause drug-induced “rebound headache”, so that you suffer from chronic migraine.