Viral fever is caused by viral infections like the common cold or flu. Symptoms include fever ranging from 99-103°F, chills, sweating, headaches and muscle aches. Viruses are transmitted through inhalation of infected droplets, ingestion of contaminated food/water, bites from insects or contact with bodily fluids. Doctors diagnose viral fever by ruling out bacterial infections through tests and considering symptoms and medical history. Treatment focuses on relieving symptoms like fever, headaches and body aches with rest, hydration and over-the-counter fever reducers.