Fingernails can grow downward as a result of a condition called nail clubbing in which the fingers grow larger, while the nails grow around and curve over the larger fingertips, explains Mayo Clinic. Health problems such as low blood oxygen, inflammatory bowel disease, AIDS and cardiovascular disease can cause clubbing.Know More
In some cases, nail clubbing runs in families and is not associated with any health problems, notes NHS Choices. However, when a person suddenly develops nail clubbing, it can be a warning sign of diseases of the lungs and heart, such as lung cancer, endocarditis and bronchiectasis. Other health issues that nail clubbing may indicate include cirrhosis, bowel cancer, stomach cancer and polycythaemia, a condition in which the blood is thicker than normal.
Some other fingernail and toenail abnormalities that can provide clues about health are brittle and crumbly nails, loose nails, thickened nails and discolored nails, according to NHS Choices. Possible causes of brittle, crumbly nails include fungal infections, thyroid problems and the skin condition lichen planus. Loose nails can signal overactive thyroid, poor circulation, an allergic reaction to a medication or a fungal infection. Potential reasons for thickened, overgrown nails include fungal infections, reactive arthritis, or shoes that are too narrow or small. Nails that are discolored a yellowish tint may result from sinusitis, jaundice, lymphoedema or tuberculosis.Learn more about Nail Care
For adults, fingernails grow at an average rate of about 1/10 of an inch per month, while they grow about 50 percent faster in children until they reach puberty. However, the rate of growth can be affected by a person's sex, level of health and the time of year.Full Answer >
Black fingernails may be the result of a hematoma, according to Dr. Melissa Conrad Stöppler writing on MedicineNet. A hematoma is a pool of blood under fingernails that is usually the result of some type of trauma.Full Answer >
Discolored fingernails can be a symptom of a fungal infection. There are also a few disorders that can cause nail discoloration, as noted by MedicineNet.Full Answer >
According to WebMD, there is nothing a person can do to make nails grow faster. Dermatologist Bruce Robinson states that all nails grow at a rate of approximately 1 millimeter per month.Full Answer >