Primary care - Medical diagnosis

Waist-to-Height Ratio Calculator: Measure Your Waist Against Your Height

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Use this waist-to-height ratio calculator for adults. Enter waist and height in cm or inches, see your ratio, measurement steps, limits and next steps.

Blood Sugar Converter: mg/dL to mmol/L

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Convert blood glucose from mg/dL to mmol/L or back. Use the two-way calculator, quick conversion table, and tips for recording a result accurately.

BMI Calculator for Adults: Calculate Your Body Mass Index

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Use this adult BMI calculator with metric or US units. See your BMI category, the formula, limits of BMI, and when a clinician can help.

Persistent Cough: When to Seek Care, What to Track, and What a Clinician May Check

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A persistent cough can have many causes. Learn when it needs urgent care, what patterns to track, and what a clinician may check.

Dizziness When Standing Up: What It Can Mean, When to Seek Care, and What to Track

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Dizziness when standing up can have many causes. Learn warning signs, safe next steps, what to track, and how clinicians check postural changes.

Blood in Stool: Bright Red vs Black, When It Is an Emergency, and What to Track

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Blood in stool has many causes. Learn what bright red, dark red and black tarry stool can mean, when bleeding is an emergency, and what to tell a clinician.

Shortness of Breath: When It Is an Emergency, What to Track, and What a Clinician May Check

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Shortness of breath can have many causes. Learn emergency warning signs, when to seek prompt care, what patterns to note, and what a clinician may check.

Leg Swelling: One Leg vs Both, When to Seek Care, and What to Track

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Leg swelling can have many causes. Learn why sudden swelling in one leg needs prompt care, what to track, and when breathing symptoms are an emergency.

Unexplained Weight Loss: What to Track, When to Seek Care, and What May Be Checked

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Unexplained weight loss can have many causes. Learn what counts as significant, what to record, when to seek urgent care and what a clinician may check.

Swollen Lymph Nodes: What the Location Can Suggest, What to Watch, and When to Seek Care

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A swollen lymph node is often linked to an infection nearby, but the full pattern matters. Learn what to note, when a short period of observation is reasonable and which symptoms need prompt care.