What Causes Excessive Yawning?

Everyone yawns sometimes. Usually, a yawn an indicator of tiredness and most of the time, yawning is completely harmless and is a natural bodily function. However, yawning excessively can indicate a problem. What constitutes excessive yawning? Excessive yawning is when a person yawns multiple times a minute. Sometimes this has a simple explanation, but sometimes yawning too often can be a sign of several serious health problems. For example, sleep disorders, mental illnesses, and certain autoimmune diseases can cause patients to yawn excessively.