What does it mean when fingernails are not smooth?

When fingernails are not smooth, it can indicate various health issues or deficiencies. Common causes include nutritional deficiencies, such as a lack of vitamins and minerals, or underlying medical conditions like fungal infections, psoriasis, or eczema. Additionally, rough or ridged nails can result from physical trauma or repetitive stress. If the texture changes persist, consulting a healthcare professional is advisable for proper evaluation.