Can I drink milk when I have a cough?
Generally speaking, it is okay to drink milk while coughing, but it should be consumed in moderation. The detailed explanation is as follows:

Milk is rich in high-quality protein, calcium, vitamins, and other nutrients, which help enhance the body's immunity. For individuals with a cough, moderate milk consumption can provide essential nutrition and promote recovery. Additionally, warm milk has a soothing effect and can relieve throat discomfort and reduce cough symptoms.
While coughing, milk should be consumed in moderation to avoid excessive intake, which may burden the gastrointestinal system. When drinking milk, ensure it is at an appropriate temperature. Cold milk may irritate the throat and worsen the cough, while overly hot milk may burn the mouth and esophagus. Warm milk is generally the most suitable choice.
During a cough, maintaining adequate water intake is important. Drinking warm water, mild salt water, or clear broth can help thin mucus and alleviate coughing. In terms of diet, consume more fresh vegetables and fruits, and avoid spicy and irritating foods such as chili peppers and pepper, which may exacerbate cough symptoms.