About Dr. John Marshall, MD
Dr Marshall is Board Certified in Family Medicine and has had a distinguished career in the US Air Force Medical Corp, retiring as Chief of Medical Staff at Brooks Air Force Base in San Antonio. He continued to serve in community medicine as Staff Physician with the University Health System in San Antonio.
Dr Marshall has served with distinction at Faith Family Family first as a volunteer and now in retirment continuing to work two days a week and vounteering at other times.
Procedures & Services
Patient Education Resources
Can ADHD be managed without medication?
Attention-deficit/hyperactivity disorder (ADHD) can be managed without medication, although medication is often a common treatment option. Medications such as stimulants (e.g. Ritalin®, Adderall) ...
Attention-deficit/hyperactivity disorder (ADHD) can be managed without medication, although medication is often a common treatment option. Medications such as stimulants (e.g. Ritalin®, Adderall) ...
Could gluten be triggering my asthma?
There is some evidence to suggest that gluten, a protein found in wheat, barley, and rye, may be a trigger for asthma symptoms in some individuals. However, the relationship between gluten and asthma ...
There is some evidence to suggest that gluten, a protein found in wheat, barley, and rye, may be a trigger for asthma symptoms in some individuals. However, the relationship between gluten and asthma ...
My PSA is elevated. What should I do next?
An elevated PSA (prostate-specific antigen) level can be a sign of prostate cancer, but it can also be caused by other conditions such as an enlarged prostate or a urinary tract infection. If your PSA...
An elevated PSA (prostate-specific antigen) level can be a sign of prostate cancer, but it can also be caused by other conditions such as an enlarged prostate or a urinary tract infection. If your PSA...
What are some treatments to get rid of warts?
The best treatment for warts will depend on the type and location of the wart, as well as the patient's overall health and preferences. Some common treatment options for warts include:Salicylic ac...
The best treatment for warts will depend on the type and location of the wart, as well as the patient's overall health and preferences. Some common treatment options for warts include:Salicylic ac...
What are the best sunscreens?
The best sunscreens are those that provide broad-spectrum protection, which means they protect against both ultraviolet A (UVA) and ultraviolet B (UVB) rays. They should also have an SPF (sun protecti...
The best sunscreens are those that provide broad-spectrum protection, which means they protect against both ultraviolet A (UVA) and ultraviolet B (UVB) rays. They should also have an SPF (sun protecti...