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Browse evidence-led guides to symptoms, diagnosis, care pathways and urgent warning signs.

A health editor reviewing evidence and clinical guidance

Guides in this topic

Evidence guide

Sexual Health

Sexual health is part of overall health. It includes physical comfort and function, protection from infection and unintended pregnancy, emotional wellbeing, respectful relationships, and the freedom to make informed choices without coercion. This guide explains the main areas of sexual health, the signs that deserve medical attention, and how to find confidential, evidence-based care.

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Evidence guide

Fertility and Reproductive Health

Fertility is the capacity to achieve a pregnancy; infertility is a condition that can involve the female reproductive system, the male reproductive system, both, or factors that remain unexplained after evaluation. This guide explains how conception happens, when to seek help, what a balanced evaluation includes, and how to interpret treatment choices without assuming that one test or one person tells the whole story.

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Evidence guide

Mental Health, Sleep and Alertness

Mental health, sleep, and daytime alertness influence one another. Low mood and anxiety can disrupt sleep; insufficient or mistimed sleep can worsen concentration, emotion regulation, and safety; and a sleep disorder can resemble or intensify a mental-health condition. This guide helps you recognize patterns, identify urgent warning signs, and prepare for an evidence-based assessment.

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Evidence guide

Infections and Antibiotic Safety

An infection begins when a harmful microorganism enters or grows in the body and causes illness. The responsible germ may be a bacterium, virus, fungus, or parasite, but symptoms alone often cannot identify which one. This guide explains how clinicians approach that uncertainty, when antimicrobial treatment may help, why unnecessary antibiotics can cause harm, and which warning signs need urgent care.

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Evidence guide

Heart and Circulation

The cardiovascular system includes the heart and the blood vessels that carry blood to and from every part of the body. Symptoms such as chest discomfort, breathlessness, palpitations, swollen ankles, leg pain, or a cold foot can reflect problems in different parts of that system—but can also come from the lungs, kidneys, liver, nerves, muscles, medicines, or other causes. This guide helps you recognize patterns, prepare for assessment, and act quickly when time matters.

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Evidence guide

Pain, Nerves and Inflammation

Pain can begin in injured tissue, inflamed structures, damaged nerves, or changes in how the nervous system processes signals. Numbness, tingling, burning, electric-shock sensations, weakness, or unusual sensitivity can suggest nerve involvement, but none proves a diagnosis on its own. This guide explains the main patterns, how peripheral neuropathy is assessed, and which neurologic changes need urgent care.

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Evidence guide

Hair Health and Hair Loss

Hair can thin because follicles gradually miniaturize, many hairs shift into a shedding phase, shafts break, the immune system targets follicles, or an inflamed scalp damages them. These processes look similar in a mirror but need different care. This guide helps you describe the pattern, understand the clinical assessment, and avoid spending on a universal “regrowth” solution before the cause is clear.

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