Pu-erh tea is not a drug, there is no contraindication, but those who do not sleep well, patients with active gastric ulcers should not drink more, and do not advocate drinking a lot of Pu-erh tea on an empty stomach. 1. Poor sleepers: Pu-erh tea contains caffeine, which has the effect of excitation of the nerves, if the phenomenon of poor sleep, it is not recommended to drink Pu-erh tea, so as not to aggravate the phenomenon of insomnia. 2. Drinking on an empty stomach: Pu-erh tea contains more tannic acid, drinking a lot on an empty stomach may induce gastrointestinal reactions, nausea and vomiting, abdominal distension and other symptoms. 3. patients with active gastric ulcers: if in the active gastric ulcers, it is not recommended to drink Pu-erh tea, Pu-erh tea contains caffeine will stimulate the secretion of gastric acid, gastric acid secretion will aggravate gastric ulcer patients gastric mucous membrane edema, congestion, is not conducive to the recovery of the condition.