why do my thumbnails have horizontal ridges

Vertical ridges can also be caused by nail injury and certain diseases, including rheumatoid arthritis, according to Rich. If, instead of a series of ridges, there's a single vertical streak, cautions Krant, this could be a sign of a tumor growing at the root of the nail. Another caveat: If the ridges have appeared and grown more pronounced very quickly or over a short period of time, they could be a sign of a very rare condition called lichen planus, which often also causes skin rash.
Did you know your finger nails can tell a doctor about your health?

Your nails reveal your health history. According to the American Academy of Dermatology, йnail problems make up about 10 percent of all dermatological conditions. Nail problems usually increase throughout life and affect a high number of senior citizens. й More importantly, the American Academy of Dermatology website revealed, йNails often reflect our general state of health.

Changes in the nail, such as discoloration or thickening, can signal health problems, including liver and kidney diseases, heart and lung conditions, anemia and diabetes. й Strangely enough when I was a teenager, I had these white small dots on my fingernails. These white spots, streak or dots on the nails are known as leukonychia. Leukonychia generally appear due to an injury to the nail.

Also, they occur because of an air bubble or bubbles between the nail bed and nail. Today, my thumb nails have vertical lines. The American Academy of Dermatology website describes these as йsplinter hemorrhages, under the nails that are caused by nail injury or certain drugs or diseases. й Ridges are also very common in your nails. There are two types of ridges -- vertical and horizontal. Most of us will have vertical ridges one time or another in our life especially as we age.

Vertical ridges are normal and do not signify any health problems. However, horizontal lines, also known as BeauБs lines may be a sign of a system health problem. In an interview with MSN Health, Dr. DБAnne Kleinsmith, a spokesperson for the American Dermatological Society said, йIf a person has been very sick or gone through a lot of stress, the nail may stop growing.

When it starts growing again, an indentation occurs at that spot on the nail. Б According to MSN Health, йAs the nail grows out over the next several months, these indentations (probably in about the same place on each nail) will become visible. A single deep ridge in just one nail may indicate that thereБs a small wart or cyst at the base of the nail that is putting pressure on the nail matrix and affecting the way the new nails grow. й