NHS A to Z: Guide to Conditions, Symptoms & Treatments

If you’ve ever typed symptoms into a search bar and ended up in a rabbit hole of unrelated results, you already know the value of a trusted health directory. The NHS Health A to Z is the official starting point for over 40 million monthly visitors looking for reliable answers about conditions, treatments, and what to do next. Rather than guessing what might be wrong, this structured guide lets you search alphabetically, by body part, or by symptom — and it tells you when to see a GP and when to manage things at home.

Primary Source: NHS.uk · Main Sections: Conditions A to Z, Health A to Z · Content Focus: Symptoms, treatments, tests

The NHS Health A to Z is split into three complementary indexes, each serving a distinct purpose: the Conditions directory for diagnosed health problems, the Symptoms guide for self-assessment, and the Tests and Treatments section for understanding procedures. According to NHS Health A to Z (the official NHS resource), this structure covers conditions, symptoms, medicines, tests, and treatments with guidance on what to do and when to get help.

NHS A to Z disease conditions

When you need to understand a specific diagnosis, the Conditions A to Z section is the first place to go. The NHS Conditions A to Z page lists health conditions alphabetically, breaking each entry down into recognisable symptoms, treatment options, and when to seek professional help. Examples include Nasal polyps, Newborn jaundice, and Night terrors — entries that illustrate how the directory handles everything from rare paediatric presentations to common adult complaints.

Each condition page follows a consistent structure: a plain-language summary at the top, followed by sections on symptoms, causes, diagnosis, treatment, and self-care. This standardised layout means you always know where to find the information you need without clicking through unrelated sections.

Symptoms and treatments

The Conditions A to Z doesn’t just list medications in isolation — it explains what treatments are typically offered and why. For example, the Tests and treatments A to Z includes entries such as CABG (Coronary artery bypass graft), Caesarean section, and Cardiac catheterisation, according to the NHS Tests and treatments A to Z section.

• Hip replacement, HPV vaccine, Hysterectomy (NHS Tests and treatments A to Z)
• Surgery, procedures, tests, screening, and other treatments
• Guidance on what to do and when to get help

How to navigate the list

You can search the NHS A to Z guide alphabetically or via the search bar for conditions like fever, according to an NHS Health A to Z walkthrough video. Alternatively, the guide is searchable by body part, subject, or A-Z menu — useful if you know something is wrong but don’t have the clinical name yet.

NHS A to Z reading

Beyond condition lookup, NHS Health A to Z serves as a broader health literacy resource. The NHS website connects you to the health information and services you need when you need them, according to an official NHS video. This means the reading material isn’t just for when you’re ill — it’s also for understanding preventative measures, recognising warning signs early, and knowing which treatments exist even if you never need them.

Health information overview

Each section uses clear, jargon-free language aimed at a general audience. The NHS.uk site is regularly updated with information on health conditions, symptoms, treatments, and medicines, according to the NHS Health A to Z YouTube channel. Content editors review pages when clinical guidelines change, ensuring the information reflects current best practice.

Medicines, tests, and treatments

The Tests and treatments A to Z page covers surgical procedures, diagnostic tests, screening programmes, and therapeutic interventions. Where relevant, pages include links to patient decision aids — short documents that help you weigh the pros and cons of a procedure before committing.

Symptoms A to Z

Before you know what condition you might have, you’re usually aware of symptoms — a persistent headache, a rash that won’t fade, unexplained weight loss. The NHS Symptoms A to Z is designed exactly for this stage of uncertainty. The section covers types of pain, stomach problems, skin symptoms, and recommended actions to take, according to the NHS Symptoms A to Z page.

Using the symptom checker

The symptom checker isn’t a diagnosis tool — it can’t replace a clinician’s judgment. What it does is help you articulate what’s happening and point you toward appropriate next steps. If a symptom page suggests “see a GP within 24 hours,” you have a concrete action rather than a vague worry. The tool links directly to relevant condition pages, so you can go from symptom to context in one click.

Common symptom guides

Symptom pages cover pain (including chest, abdominal, and joint pain), digestive issues (bloating, constipation, diarrhoea), skin changes (rashes, moles, lesions), and general signs like unexplained fatigue or fever. Each guide explains the typical causes and when self-care is sufficient versus when professional evaluation is warranted.

If you’re experiencing pain on the left side of your stomach, the NHS symptom checker can help narrow down whether it warrants immediate attention or can be managed at home.

Medical conditions list A-Z

The full A to Z list of common illnesses spans conditions that affect every major body system. NHS Inform (the Scottish equivalent) offers its own illnesses and conditions A to Z covering causes, treatments, and when to seek help, providing a parallel resource for readers in Scotland, according to the Nidirect campaign page.

100 most common medical conditions

While the NHS doesn’t publish a definitive “top 100” list, the Conditions A to Z directory includes the health problems most frequently managed in primary care. This includes cardiovascular conditions (heart disease, high blood pressure), metabolic disorders (diabetes, thyroid problems), mental health conditions (depression, anxiety), and common infections (UTIs, respiratory viruses).

List of diseases in humans

The NHS Health A to Z covers diseases in humans across infectious, genetic, environmental, and lifestyle-related categories. What makes it different from a simple list is the clinical context: each entry explains not just what the condition is, but how it progresses, what triggers it, and how it can be managed or cured.

Symptom checker NHS

The NHS symptom checker is embedded within the Symptoms A to Z section, but it functions as a decision-support tool rather than a diagnostic engine. It works by presenting a series of questions about your symptoms, duration, severity, and other factors, then recommending a care pathway — from self-care at home to seeing a GP within a certain timeframe to calling 999 for emergencies.

How it works

You enter your primary symptom, answer a short questionnaire, and receive a personalised recommendation. The logic is based on clinical algorithms reviewed by NHS professionals and aligns with NICE (National Institute for Health and Care Excellence) guidance. Research from PMC (PubMed Central) shows that NHS Talking Therapies provides cognitive behavioural therapy (CBT) and other therapies for depression and anxiety, demonstrating how NHS digital tools integrate with broader care pathways.

Integration with A to Z

After the symptom checker gives you a next step, it links directly to the relevant Conditions A to Z page or the Tests and treatments A to Z section. This creates a continuous journey from symptom to understanding to action. The NHS A to Z connects to health information and services anytime, according to an official NHS video, making it useful both during and outside GP surgery hours.

For patients managing conditions like high cholesterol, combining NHS symptom guidance with targeted information like serum LDL cholesterol level monitoring can support more informed discussions with healthcare providers about treatment options.

“Acting F.A.S.T. as soon as stroke symptoms present themselves can not only save lives but potentially limit long-term effects.”

— Meads Medical Centre (Medical Practice)

“The NHS website connects you to the health information and services you need when you need them.”

— NHS (Official NHS Video)

“NHS Talking Therapies (NHS TT), previously known as Improving Access to Psychological Therapies (IAPT), is a large-scale, publicly funded programme.”

— PMC Researchers (PMC Study)