This reference volume conveys complete understanding and management of Androgenetic Alopecia and Female Pattern Hair Loss (AGA/FPHL). These are probably the most common adult (18-50 yrs.) health disorders besides dental caries, accounting for over 98% of hair loss cases in males and over 70% cases in females. The present volume, the first of three related volumes, is structured in 4 sections: 22 dedicated chapters, ranging from basic science (Biology, Anatomy, Physiology, Embryology), the etiology of adult, childhood & adolescent AGA/FPHL, diagnostic steps and evaluation, to related disorders and comorbidities. For the first time in the scientific literature, all pathogenic contributors of AGA/FPHL, including micro-inflammation, scalp vascularization, biochemical stress, aging, solar radiation, and the sebaceous gland, are examined in comprehensive, dedicated chapters. The effects of every hormone on AGA/FPHL, as well as the psychological impact of the condition, are explored in depth. An extensive chapter on childhood and adolescent AGA/FPHL, a more common than previously thought condition, is another unique feature. Finally, two extremely detailed sections are included on the pathogenic links of AGA/FPHL to life-threatening comorbidities: cardiovascular disease, metabolic syndrome, hypertension, insulin resistance, and prostatic disorders, with suggested guidelines on how to save lives of balding patients by adopting early screening strategies.