Some diseases can cause a significant deterioration in the victim’s health, which requires immediate first aid and emergency medical care. Sometimes a sudden attack of the disease occurs without any preliminary symptoms. In some cases, the victim may simply feel unwell or uneasy. In an emergency situation, you may not know what caused it, but you can provide first aid. Any time you are unsure about the condition of the victim, contact the ambulance service. This section will cover sudden onset illnesses, including diabetic emergencies, seizures, high fever, fainting, severe abdominal pain and emergency labour. In all cases, follow the basic principles of first aid.