There is no evidence of a connection between yawning and heart problems. Some people with heart disease may yawn because they are feeling anxious. This can be a sign of anxiety called tachycardia, which is when your heart beats faster than usual. If you have heart disease, talk to your doctor about how you can deal with stress and anxiety. It is also possible to have what is known as “psychogenic polydipsia,” which is excessive thirst due to psychological factors. In this case, it is not known whether or not the patient will also experience excessive yawning. Still, it is highly likely since the mechanisms of the two are closely related.