Drinking cold water for a long time may stimulate the respiratory mucosa, cause vasoconstriction of the gastric mucosa, cause vasospasm and so on.
1. Stimulate the respiratory mucosa: cool water will stimulate the respiratory mucosa, coughing, coughing up phlegm symptoms, especially for the immune system is relatively low for the crowd is very easy to induce a cold.
2. cause gastric mucosal vasoconstriction: cool water into the stomach can cause gastric mucosal vasoconstriction, so that the activity of digestive enzymes to reduce the symptoms of indigestion.
3. cause vascular spasm: for the elderly, especially patients with cardiovascular diseases, long-term drinking cold water can cause vascular spasm, induced angina pectoris and cerebral arterial blood supply is insufficient, the anterior region of the heart pain, headache, dizziness and other symptoms.
It is best to drink less cold water in daily life, especially for those who have a weaker constitution, you can replace it with warm water and plain water.