You should not drink alcohol when you have a cold.

Drinking alcohol during a cold often exacerbates the clinical symptoms of the cold, worsening the condition, and may even increase complications in some patients. Cold sufferers often experience marked upper respiratory tract catarrhal symptoms, and some may also feel generally unwell. Drinking alcohol can exacerbate these respiratory symptoms and sometimes lead to bacterial infections due to lowered immune defenses, resulting in acute suppurative tonsillitis, pneumonia, bronchitis, and other conditions.

Moreover, drinking alcohol when you have a cold can trigger gastrointestinal disturbances, especially in patients with gastrointestinal-type colds, noticeably worsening symptoms such as nausea, abdominal bloating, and diarrhea. In cases of severe colds, where patients take oral cold medications, drinking alcohol can increase the adverse reactions of these medications, causing significant discomfort. Some bacterial colds require antibiotic treatment, especially oral cephalosporin antibiotics, where drinking alcohol may induce a disulfiram-like reaction; therefore, it is prohibited for cold sufferers to drink alcohol.