When patients have pain in the throat and cough with blood, the common causes include acute inflammation, mucous membrane damage, and violent coughing, etc., as follows: 1. Acute inflammation: Acute inflammatory factors in the throat often lead to congestion, swelling, and dilatation of the local mucous membrane. 2. Mucous membrane damage: Some patients may have localized damage to the mucous membrane of the throat and a small amount of blood leakage, which may further lead to coughing with blood. 3. 3.Vigorous cough: Some patients may have strong impact on the mucous membrane of the throat due to vigorous coughing, which may also cause the local mucous membrane to break down and a small amount of blood leakage. If the symptoms of coughing up blood repeatedly occur, a careful and comprehensive examination of the entire respiratory tract is required. A comprehensive analysis of the patient’s specific causes of the disease should be conducted, and targeted treatment and improvement measures should be taken, as well as attention to the detection of abnormal growths in the respiratory tract.