Is watermelon cool or hot in nature?
Generally speaking, watermelon is considered a cooling food in traditional Chinese medicine. The specific analysis is as follows:

Watermelon is cold in nature and sweet in taste, possessing functions of clearing heat and relieving summerheat, promoting saliva secretion and alleviating thirst. During hot summer weather, consuming watermelon can help relieve discomforts such as dry mouth, sore throat, and irritability caused by high temperatures. Especially for individuals with excessive internal heat or damp-heat, moderate consumption of watermelon can help balance yin and yang within the body, assisting in restoring physical comfort.
However, if a person has a weak spleen and stomach with coldness, excessive consumption of watermelon may worsen internal cold accumulation. This situation may easily lead to abdominal pain, diarrhea, or indigestion. Individuals with cold body constitution should control their intake of watermelon and avoid consuming it on an empty stomach or at night to prevent unnecessary strain on the body.
In addition, watermelon has a high sugar content, so diabetic patients need to control their intake to avoid blood sugar fluctuations. Patients with impaired kidney function or those needing to restrict fluid intake should also consume watermelon cautiously to avoid increasing the burden on the kidneys.