. In fact stress is the main reason of being ill. It can cause health problems such as aches and heart attacks. Also, they might have physical problems like hair loss, feeling tired and losing or gaining weight. In addition, it can even damage our brain. Stress is the cause of losing cells in the human brain. According, some research suggests that long-term stress stimulates the growth of the proteins that might cause Alzheimer's. And that can lead to memory loss.