Those with out of control diabetes may be breathing very fast. This may occur with a subdural hematoma, epidural hematoma, or subarachnoid hemorrhage. This can occur with severe lung or heart disease. For example, severe asthma , emphysema , irregular heartbeats, or arrhythmias , and a blood clot in the lung, called a pulmonary embolus , can all cause coma from low oxygen levels. Sometimes, the cause cannot be found.
Prevention is related to the cause.
For example, avoiding drug use can prevent cases due to overdose. Proper treatment of diabetes can prevent many cases due to this cause. Wearing a helmet when riding a motorcycle or bike can prevent head injuries leading to coma. Following sports safety guidelines for children , adolescents , and adults can avoid unnecessary accidents. Many cases cannot be prevented.