Weak heart pulse may be caused by cardiac insufficiency, severe anemia, low body weight, hypothyroidism, and so on. 1. Cardiac insufficiency: Weak heartbeat may occur in patients with various organic diseases, such as heart failure, acute myocardial infarction, and combined coronary artery disease. 2. Severe anemia: When severe anemia occurs, weak heartbeat may also occur. 3. Low weight: Weak heart may occur in patients who are malnourished, underweight and thin. 4. Hypothyroidism: When hypothyroidism occurs, the heart rate may slow down. Weak heart pulse refers to the slowing down of heart rate and lowering of heart sound. If you find that you have weak heart pulse, you should consult your doctor in time and follow the doctor’s instructions to make adjustments.