Doctor insights on:
What Causes Viral Infection
Infections are invasions of some other organism (fungus, bacteria, parasite) or viruses into places where they do not belong. For instance, we have normal gut bacteria that live within us without causing problems; however, when those penetrate the bowel wall and enter the bloodstream, ...Read more
Many causes: Many sore throats are caused by a viral illness, such as: the common cold, the most common type of viral infection. Infection of the voice box (laryngitis). Mononucleosis (mono, "the kissing disease"), a viral infection that tends to cause a persistent sore throat. Other viral infections, such as mumps, herpangina, or influenza. Can also cause sore throat. ...Read more
The other way around: Leukocytosis is an abnormally high number of white blood cells in the blood, as measured on a blood test. Both viral and bacterial infections can sometimes cause high numbers of white blood cells (wbc's) or low numbers of wbc's (leukopenia). Unusual leukocytosis, not caused by an infection, can be due to a bone marrow problem such as an early stage of leukemia. A doctor can further evaluate. ...Read moreSee 1 more doctor answer
Bacterial invasion: This is a very broad question because there are hundreds of bacteria that cause human infection and there are many causes. In general terms when a pathogenic bacteria can attach to or invade through a surface of the body or intestinal tract or lungs in a susceptable person they can initiate an infection. ...Read more
Candida (overgrowth): Candida is the usual cause of yeast infections in a person. Candida is always in or on our bodies, in small amounts that are invisible. Candida lives with us, normally. It causes symptoms if it invades into parts of our bodies where candida is not supposed to go, or it causes symptoms if it is indeed staying where it should but is overgrowing in large amounts (such as with oral or vaginal thrush). ...Read more
Fungus: Yeasts are microscopic organisms that are a type of fungus. Abnormal overgrowth of these fungi happen in a "yeast infection". This can be triggered by changes in ph (acidity) of the environment / anatomic location or by other factors such as taking antibiotics (which cause altered flora). Decreased immune system function may also be related to yeast infections. Hope that this helps. ...Read more
More than natural: Having more yeast than there naturally should be in a particular part of the body... is what causes a yeast infection. Yeast and fungi are part of our lives on Earth. They are always with us, but when they end up in places or in numbers that are not natural, we call it an infection. Sometimes we call it an overgrowth, if the location is normal but the yeast numbers are too high. ...Read more
A pattern: In general a bacteria,like a staph abscess, enters the body and attacks a specific region or site, spreading locally. Viruses usually enter the body through the soft tissue of the oral cavity, eyes or nose.Viruses must enter tissue to survive and reproduce, then spread to the blood where they can quickly spread to all areas of the body, where it can trigger "systemic" symptoms. ...Read more
Lots of things: Anything that clogs the nose can block the sinuses. Common causes of nasal swelling include upper respiratory tract infections (colds) and allergies. Once the sinuses cannot drain, bacteria can accumulate in the sinuses and increase in large enough numbers to cause the symptoms of infection. The bacteria can come from various sources, including the nasopharyx and the adenoids that reside there. ...Read more
Surgical trauma: Labyrinthitis by definition is an inflammation of the inner ear. The inner ear has both the organ for hearing (cochlea) and the organs of balance. Bacterial infections of the labyrinth are very rare and life-threatening. The cause of inner ear inflammation is usually viral but can certainly follow middle ear or inner ear surgery. Middle ear infections can also penetrate into the inner ear. ...Read more
Several factors: Several factors can cause chronic yeast infections- 1. Local balance of normal flora is disrupted, typically from the recent user of antibiotics; 2. Impaired immunity- this may be due to steroid use or having other illnesses such as hiv; 3. Misdiagnosis of symptoms in the absence of yeast from testing- adverse drug effects can be mistaken as a yeast infection. Consult your gyn or id specialist. ...Read more
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