People with tachycardia are advised not to drink coffee. This is because coffee contains caffeine, which can stimulate the sympathetic nervous system and increase heart rate. This is especially true for individuals with coronary heart disease, mental disorders, viral myocarditis, and rheumatic heart disease, who also experience tachycardia and should avoid coffee. Drinking coffee can lead to increased heart rate and additional burden on the heart, posing significant risks to the body. Patients with organic heart disease should generally consume less spicy, stimulating, and exciting foods to avoid increasing the heart's burden.