Causes. Mental illnesses, in general, are thought to be caused by a variety of genetic and environmental factors: Inherited traits. Mental illness is more common in people whose blood relatives also have a mental illness. Certain genes may increase your risk of developing a mental illness, and your life situation may trigger it.
Causes. Influenza viruses travel through the air in droplets when someone with the infection coughs, sneezes or talks. You can inhale the droplets directly. Or you can pick up the germs from an object — such as a telephone or computer keyboard — and then transfer them to your eyes, nose or mouth. People with the virus are likely contagious from about a day before symptoms appear until ...
Severe headaches can be caused by headache syndromes, medication overuse, underlying medical conditions, decreased/increased pressure and arterial problems. Most people get mild headaches from time to time. However, some conditions cause recurring headaches so severe that it is impossible to continue normal daily activities.