Dr. Mark Thomas O'hollaren M.D.

What does the term “low immunity” mean?When you notice that your child catches a cold or the flu more often than other family members, or when it takes a long time for any wounds to heal, you begin to think that there is something wrong with your child's resistance.Low immunity is a term that...

What is a persistent cough?It can be annoying to have a cough that lasts for more than a couple of weeks. A cough is considered chronic or persistent if it does not go away after four weeks in children and eight weeks in adults. However, most persistent coughs are due to colds, flu, infection, or...

Lupus or systemic lupus erythematosus (SLE) is a chronic autoimmune condition where your immune system sees your own tissues as foreign cells and therefore starts to produce antibodies against them. Since the antibodies are produced by your own cells, these antibodies are given the term...

The inflammation of the sinuses found in your forehead, cheekbones, and behind your nose is what is known as sinusitis. Sinusitis can be a short-term inflammation resulting from a bacterial infection after an infection like the common cold. However, sinusitis can also be chronic, resulting from...

Pollen grains from flowers are the main cause for spring allergies. When pollen enters an individual's nasal cavities, particularly in those who are allergic to them, it stimulates the immune system to react in an allergic response. Antibodies produced by the immune system start attacking the...

There are a number of triggers that can cause eczema flare-ups. Most patients will identify these on their own and possibly take steps to avoid them. However, whether diet can cause eczema flare-ups is still a bone of contention.For a long time, it had been held as an unprofessional myth or...