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From aad.org, a report on how stress can affect your nails:

Nails are not immune to showing outward signs of stress, and some people develop the nervous habit of biting their nails or picking at them when they feel stressed. Another stress-related nail habit that Dr. Mayoral discussed is people who rub their fingers over their thumb nail, which can create a ridge across the nail. This rubbing causes a distortion of the nail plate, and when the nail grows, a raised ridge forms in the middle of the nail. In addition, physical or emotional stress, certain diseases, and chemotherapy can cause white horizontal lines to appear across the nails. Brittle, peeling nails also are a common side effect of stress. “Sometimes patients with nail problems are not aware that their habits or tics from being stressed out or nervous are at the root of their problem,” said Dr. Mayoral. “There are instances where patients self-inflict skin, hair or nail problems that go beyond what we normally expect from stress, and these patients often need psychological help to modify their behavior.”