Here are few potential side effects of Black Coffee:

Insomnia: Due to its caffeine content, it can interfere with sleep patterns if consumed late in the day or in excessive amounts.

Bone Health Concerns: Excessive caffeine intake, may interfere with calcium absorption and potentially contribute to osteoporosis in susceptible individuals.

Anxiety and Jitters: Excessive caffeine intake from black coffee can lead to feelings of anxiety, nervousness, and jitteriness.

Staining of Teeth: The dark pigments in coffee can stain teeth over time, leading to discoloration.

Increased Heart Rate and Blood Pressure: It can temporarily raise heart rate and blood pressure, which may be concerning for individuals with heart conditions or hypertension.

Dependency and Withdrawal: Regular consumption of black coffee can lead to caffeine dependency, and sudden cessation may cause withdrawal symptoms like headaches, irritability, and fatigue.

Digestive Issues: Some individuals may experience stomach discomfort, acid reflux, or diarrhea from the acidity of black coffee, particularly on an empty stomach.