Polycystic Ovary Syndrome (PCOS): Symptoms, Causes, and Treatment

1. Definition & Epidemiology PCOS is a heterogeneous endocrine disorder affecting up to 12% of women of reproductive age (15–44 years) ScienceDirect+15PMC+15AAFP+15. Characterized by hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology…

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Attention-Deficit/Hyperactivity Disorder (ADHD): A Clinical Overview

1. Definition & Core FeaturesAttention-deficit/hyperactivity disorder (ADHD) is a chronic, neurobiological neurodevelopmental disorder characterized by a persistent pattern of inattention and/or hyperactivity–impulsivity that interferes with functioning or development. Symptoms must…

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Transcranial Direct Current Stimulation (tDCS): Mechanism, Evidence, and Clinical Considerations

Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulation technique that delivers weak, constant direct current (typically 0.5–2 mA) to the cerebral cortex through saline-soaked sponge electrodes placed on the…

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