Avitaminosis: Etiology, Clinical Manifestations, Diagnostic Approaches, and Modern Treatment Strategies

Abstract

This Avitaminosis refers to a pathological condition resulting from prolonged deficiency of one or more essential vitamins, leading to metabolic dysfunction, structural tissue damage, and systemic clinical manifestations. Despite global advances in nutrition and food fortification, vitamin deficiencies remain prevalent in both developing and developed countries due to malnutrition, chronic diseases, malabsorption syndromes, restrictive diets, alcoholism, and socioeconomic factors. Fat-soluble vitamin deficiencies (A, D, E, K) often present with visual impairment, bone demineralization, neuromuscular dysfunction, and coagulopathy, whereas water-soluble vitamin deficiencies (B-complex and C) manifest as anemia, neuropathy, dermatitis, cognitive impairment, and impaired wound healing. Diagnosis is based on clinical evaluation, dietary history, biochemical assays, and functional biomarkers. Modern treatment strategies emphasize targeted supplementation, correction of underlying etiologies, dietary modification, food fortification, and public health interventions. Early detection and individualized management are essential to prevent irreversible complications. This article reviews the etiology, clinical features, diagnostic principles, and contemporary therapeutic approaches for avitaminosis, highlighting the importance of prevention and multidisciplinary management. Avitaminosis represents a systemic pathological state caused by sustained insufficiency of essential micronutrients necessary for normal biochemical reactions, cellular metabolism, and organ function. Although global nutritional standards have improved, vitamin deficiencies continue to affect diverse population groups due to unbalanced diets, gastrointestinal disorders, chronic systemic illnesses, restrictive eating patterns, aging, and increased physiological demands. The clinical spectrum varies widely depending on the specific micronutrient involved, ranging from mild constitutional symptoms to severe neurological, hematological, skeletal, and immunological impairments. Contemporary diagnostic strategies rely on detailed nutritional assessment combined with laboratory measurement of serum vitamin concentrations and functional metabolic markers. Timely therapeutic intervention through individualized supplementation and correction of predisposing conditions significantly improves prognosis and prevents irreversible complications. Preventive measures, including public health nutrition programs and dietary education, remain fundamental in reducing global disease burden associated with micronutrient insufficiency.