Infections caused by viruses are called viral infections. Viruses are tiny pathogens that use a person’s cells to replicate repeatedly. They usually cause digestive and respiratory illnesses, but some variants can also affect other body functions. Common viral illnesses include the flu, cold, and herpes (cold sores). These go away on their own in most cases but can sometimes cause life-threatening or chronic health problems. Here are the types and early symptoms of viral infections. Types of viral infections Viral infections are usually classified depending on the body part they infect, how they spread, and the symptoms they cause. Certain viruses, such as adenovirus and herpes virus, can cause different health problems. The common types of viral infections include the following: Respiratory viral infections Respiratory viral infections start in the lungs, airways, throat, and nose. These infections cause pneumonia, ear infections, sinusitis, and bronchitis. Some common types of respiratory viral infections include: Common cold, which is generally caused by rhinovirus Flu caused by influenza Respiratory syncytial virus (RSV) Human metapneumovirus (hMPV) Parainfluenza Viral infections in the digestive system Viral infections can affect any part of the digestive system but usually start in the stomach, intestines, gastrointestinal tract, or liver. Some common types of digestive system viral infections include the following:

Respiratory Syncytial Virus (RSV) is a respiratory virus that causes common cold-like symptoms. Generally, it affects those with weakened immunities, such as infants and older adults, more than others. Although people with this condition recover from it within a week or two, it can become dangerous for individuals with compromised immune systems. For children especially, people must sense certain warning signs of this condition at an early stage. Here are a few warning signs: Runny nose RSV is known to cause inflammation in a child’s upper respiratory tract which consists of the nose and throat. Children with early-stage RSV will have an excessive amount of mucus produced in their bodies, causing them to blow their noses every now and again. Like many other symptoms of RSV, this one also closely resembles those related to a common cold. Decreased appetite The cold-like symptoms of RSV make it difficult for children to taste and smell food components properly. Additionally, the virus also tends to block kids’ throats with an excessive amount of phlegm. This causes them to have great difficulty not only in eating, drinking, and swallowing meals and drinks, but also completely takes away their sensory enjoyment of all foods. As a result, children with RSV will slowly experience a progressive reduction of appetite.

Pneumonia is a common respiratory infection that can affect people of all ages, causing various symptoms that vary in severity. At the same time, many are familiar with the hallmark signs such as fever and cough, shortness of breath, chest pain, and numerous other indicators that can point to pneumonia. This comprehensive article thoroughly explores pneumonia’s signs and symptoms, helping individuals recognize the condition early and seek appropriate medical care. Fever Fever is one of the most prevalent symptoms of pneumonia. It typically presents with a high body temperature, often exceeding 100.4°F (38°C). Fever is the body’s natural response to infection and signifies that the immune system is actively fighting the pneumonia-causing pathogens. Cough A persistent cough is another hallmark symptom. It can produce different types of mucus, including yellow, green, or bloody. The cough may be accompanied by chest pain or discomfort ranging from mild to severe. Shortness of breath Many individuals with pneumonia experience shortness of breath, particularly when engaging in physical activities. This symptom occurs due to the inflammation and infection within the lungs, making it challenging for the respiratory system to function optimally. Chest pain Chest pain is often described as a sharp or stabbing sensation typically felt on the side of the affected lung.