Hi and welcome to HCM You seem to have a possible condition of the nails called onychorrhexis, with thinning and splitting of nails. There are various causes, mostly associated with underlying weakness or general deficiency in the body. Some of the causes to rule out are - recent illness, fever, long term illness, any long term medication. Possibility of thyroid disorders, anemia, low iron,nutritional deficiency or poor diet. Also rule out any skin rashes, itching or skin disorders you may have developed. Nail changes are seen in some skin disorders like lichen planus. Check with a dermatologist to rule out other illnesses and skin problems. Fungal infection maybe checked for. Rule out the possible causes and treat as required. You need to take a vitamin supplement with Biotin for better growth. Take evening primrose oil or Omega-3 oil capsules daily. Moisturise well and keep away from harmful chemicals, excessive washing, detergents.etc Make sure to eat healthy. See a dermatologist regarding follow up and improvement. Hope this helps.