A medical emergency can arise anytime and that is the time when you need to reach out to a qualified doctor, ASAP. It may be that your child wakes up with sudden high fever in the middle of the night or the elderly, ailing parent has another bout of heaviness in the chest and you do not know what to do!
During all these situations, one feels anxious and helpless especially when your doctor does not answer the phone. Also, it is not always feasible to rush to a doctor at odd hours especially when there is no guarantee of finding him in the clinic or hospital.