What is the cause of weakness and fever?

Body weakness and fever may be caused by respiratory tract infection, acute gastroenteritis and food poisoning.
1. Respiratory infections: generally due to viruses, bacteria attacking the human body caused by fever, fever is the body’s immune system to resist germs will occur after a series of reactions to the main reason, fever will consume the body’s energy, the lack of energy supply will lead to physical weakness.
2. Acute gastroenteritis: Gastroenteritis is a series of symptoms caused by improper diet and decreased resistance, such as stomach pain, nausea, vomiting, weakness and fever. Fever is caused by co-infection of bacteria and virus.
3. Food poisoning: Food poisoning is usually caused by infection. If food poisoning is not controlled in time, it will aggravate the condition, thus causing recurrent fever. Food poisoning not only causes fever, but also vomiting, fatigue, abdominal pain and diarrhea.
Weakness and fever may also be caused by other reasons, so you should go to the hospital and have a detailed examination with your doctor for proper treatment.