Need expert advice. what health problem or nutrition problem could cause my nails to split?

See below: •Brittle nails may occur due to medical problems, including gland (endocrine system) diseases, tuberculosis, Sjögren syndrome, and malnutrition. •People with other skin diseases, such as lichen planus and psoriasis, as well as people taking oral medications made from vitamin A, may also develop nail splitting- the most common cause of split nails is from frequent wetting and drying of hands-