: Hypothyroidism (underactive thyroid), sleep apnea, or electrolyte imbalances. Treatment Options
According to the Mayo Clinic , treatment depends on the underlying cause: Bradycardia - Symptoms and causes - Mayo Clinic bradycardia
Bradycardia becomes a clinical issue when the heart is beating so slowly that it cannot pump enough oxygen-rich blood to the brain and body. Symptoms of "symptomatic bradycardia" include: or lightheadedness. Fatigue or feeling weak during normal activities. Shortness of breath or chest pain. Fainting (syncope) or near-fainting spells. Confusion or difficulty concentrating. Common Causes : Hypothyroidism (underactive thyroid)
: Highly active individuals often have resting heart rates below 60 bpm because their heart muscle is efficient enough to pump plenty of blood with fewer beats. bradycardia