When the thyroid is underactive, it produces less of the important hormones that regulate your metabolism and keep your body functioning properly. And when metabolism slows, the result is typically weight gain and water accumulation.

Ask your doctor about a routine thyroid check, which is a blood test that measures the level of thyroid-stimulating hormone, or TSH. Make sure your doctor is aware of new screening guidelines, which state that TSH level should be between 0.3 and 3.0.

Anemia, most commonly caused by iron deficiency, causes pale nails when there aren't enough red blood cells circulating in the bloodstream. If uncorrected over time, severe iron deficiency can also cause the nails to have a slightly concave shape.

Iron deficiency can lead to fatigue or, in serious cases, heart problems, so you'll want to alert your doctor if you think you might be iron-deficient. Your doctor may recommend medication and will likely recommend increasing your dietary intake of iron-rich foods, such as red meat, spinach and other dark greens, and nuts.

Alone from this symptom you cannot find out ill health, some of the people who are having clubbed fingers are suffering from breathing difficulties also and they are also undergoing treatment.

Fingertips that are gray- or blue-tinged or feel numb can be a sign of a circulatory disorder known as Raynaud's disease or Raynaud's syndrome.
If you are suffering from Reynaud’s disease, your fingers will change periodically to blue or white, basically when they come in contact with something cold. This phenomenon generally affects women more as compared to men, it is strange and harmless.
In this disease the blood vessels go into spasm and to the extremities it completely closes off, as a result the fingers turn white or blue. You should wear gloves and also avoid touching cold things, if you suffer from this disease.