When brain cells are dehydrated by increased extracellular fluid osmolarity, it can cause a series of symptoms of central nervous system dysfunction, including drowsiness, muscle twitching, coma, and even death. It is hypertonic dehydration. When the brain volume is significantly reduced due to dehydration, the vascular tension between the skull and cerebral cortex increases, thus leading to local intracerebral hemorrhage and subarachnoid hemorrhage due to venous rupture. Then we must learn the scientific method of drinking water to prevent hypertonic dehydration. 1, to drink water regularly, do not only remember to drink when thirsty To know, when the body especially want to drink water, the body’s organs have been operating at the limit of a situation. Experts recommend that it is best to develop the habit of drinking water regularly. In general, it is best to get up early in the morning, brush your teeth and drink a glass of plain water, a glass at ten in the morning, another glass before lunch, a glass at about three in the afternoon, and another glass at night before going to bed. 2, to drink more boiled water, do not drink raw water Boil and boil for 3 minutes of boiling water, can make the water chlorine and some harmful substances are evaporated, but also to maintain the water on the human body must be nutrients. Drinking raw water has many harmful effects, because the chlorine in tap water can interact with the residual organic substances in unboiled water, leading to increased chances of bladder cancer and rectal cancer. 3, to drink fresh water, do not drink the water placed too long Fresh water, not only sterile, but also contains a dozen minerals needed by the human body. But if the time is too long or drinking automatic water heater overnight reboiled water, not only no more various minerals, but also may contain certain harmful substances, such as nitrites. The resulting nitrite poisoning is not uncommon. 4, to drink more warm water with salt, do not drink ice water In the summer, many people in a lot of sweating, choose to drink ice water or cold drinks. In fact, this is not scientific. Because although this will bring temporary comfort, but a lot of drinking ice water or cold drinks, will lead to poor sweat pore catharsis, muscle heat dissipation difficulties, residual heat accumulation, very easy to trigger heat stroke. The right way is to drink more salt water with a little salt to replenish the lost salt and water. After the salt water enters the muscle, it will quickly penetrate into the cells, so that the muscle that is constantly sweating and is dehydrated will be replenished with water in time.