Viral fever is a common condition caused by various infections like influenza, dengue, typhoid, malaria, and chikungunya. Typical symptoms include fever, headache, muscle and joint pain, fatigue, skin rashes, and nasal congestion, with each infection having its own specific signs. For instance, malaria often involves chills and sweating, while dengue may cause nausea, rashes, and abdominal pain. These infections spread through contaminated food and water, mosquito bites, and direct contact with bodily fluids, posing a higher risk to those with weakened immune systems.