People with hypothyroidism may want to consider minimizing their intake of gluten, a protein found in foods processed from wheat, barley, rye, and other grains, says Ruth Frechman, RDN, a dietitian and nutritionist in the Los Angeles area and a spokesperson for the Academy of Nutrition and Dietetics.
Yellow Nails. One of the most common causes of yellow nails is a fungal infection. As the infection worsens, the nail bed may retract, and nails may thicken and crumble. In rare cases, yellow nails can indicate a more serious condition such as severe thyroid disease, lung disease, diabetes or psoriasis. Swipe to advance.
Red discoloration under your fingernails can be caused by a number of conditions, some of which could be serious. Talk with your doctor or dermatologist about what may be causing the redness.Some conditions that can lead to a red or brown discoloration under your nails include the following: 1  A splinter hemorrhage.2  This vertical red or brown line under the nail can be caused by an injury, fungal infection, or nail psoriasis, or can be a sign of a heart condition. This vertical red or brown line under the nail can be caused by an injury, fungal infection, or nail psoriasis, or can be a sign of a heart condition. 2  Heart failure. 3  This can cause redness in the white half moon at the bottom of your nail. 4  Kidney disease.