There are many dangers of washing your hair with cold water.

1. The chance of getting a cold will be greatly increased

In hot seasons and after exercise and work, cold water has many negative consequences. Many people like to wash their hair with cold water on hot days when they are sweating profusely. Doing so can easily cause vascular dysfunction. The arteries in the human brain are very sensitive to pain. In the hot season, the head is prone to sweating after exercise. At this time, the blood vessels dilate. If washed with cold water, it may cause abnormal intracranial blood vessel function, causing dizziness, dark eyes, and vomiting. In severe cases, it may cause Intracranial bleeding, so be sure to rinse with warm water after heavy exercise.

2. In the cold winter, washing your hair with cold water can easily cause colds and frostbite

In the cold winter, the cold wind is bone-piercing. Washing your hair with cold water will cause blood vessels to contract, body temperature to drop, and the body to catch cold, leading to colds. In addition, people are prone to respiratory diseases caused by wind and cold, and typhoid bacilli and tuberculosis bacilli may even take advantage of this. The water in winter is freezing cold. If you wash your hair with very cold water, your skin will get frostbite and frostbite over time.

3. Washing your hair with cold water will not clean your hair

Compared with warm water, the effect of washing your hair with cold water is very poor. Because warm water can expand skin capillaries and superficial dermal blood vessels, open sweat pores, and promote the excretion of metabolic waste. It has stronger decontamination power than cold water, and dirt attached to the hair shaft is easier to remove. On the contrary, the sudden cold stimulation of cold water causes the contraction of skin capillaries and superficial dermis blood vessels, which in turn leads to the contraction of sweat pores, blocking the normal skin metabolism, and removes the dirt that could have been removed and some of the toxins hidden in the sweat pores that should be discharged. Metabolites will stay in the body. Over time, you will find that not only is your hair not clean, but also long-term use of cold water to wash your hair will cause hair loss due to metabolic disorders.

4. Destroy your nerve lines

Our scalp is one of the areas with the most nerves. It is closest to the human nerve center, the brain, and is of the same origin. Our nerves will react when stimulated, and the brain's excitation and inhibition have certain limits. If the parts that should be inhibited are constantly stimulated, the rules of excitation and inhibition will be disrupted, leading to diseases. This kind of neurological disease is medically called neurological headache. Nervous headaches are divided into three major categories, functional headaches, vascular headaches and tension headaches.

Headache caused by cold water stimulation is a tension headache. Most patients have headaches on both sides. At the same time, due to the sudden stimulation of cold water, the rich capillaries of the scalp will suddenly contract. This contraction will cause the cerebral blood vessels to have less volume, and the blood pressure will rise accordingly, causing vascular headaches. Tension headaches and vascular headaches add up to form mixed headaches.

If this happens every day and lasts for a long time, the pain will escalate, and it will also be accompanied by dizziness, irritability, anxiety, palpitation, shortness of breath, fear, tinnitus, insomnia and dreaminess, waist and back pain, Neck stiffness and other symptoms, some patients have obvious tender points on both sides of the neck pillow. The patient may even have headaches throughout the day.