Free AI Symptom Checker
Describe what you are feeling in your own words. Dr. Khan AI asks the structured follow-up questions a thoughtful clinician would, and gives you a clear answer about whether and how urgently you should see a doctor. Anonymous, instant, free.
No signup. No data stored. Privacy by design.
What an AI symptom checker actually does
A symptom checker takes what you can describe about how you are feeling and turns it into a structured assessment. The traditional version — the one most people are familiar with from WebMD, Mayo Clinic, or a checkbox questionnaire on an insurance site — gives you a list of possible conditions ranked by likelihood. Useful, but it cannot react when your answer is something the form did not anticipate.
Dr. Khan AI is a conversational symptom checker. You write your symptom the way you would tell a friend who happens to be a doctor: “I have had this dull headache for three days, mostly behind my eyes.”The AI reads that, asks the follow-up questions a clinician would ask next (severity, triggers, accompanying symptoms), reasons across your answers, and gives you a structured response with a clear next step.
It is not a diagnosis. No software is. What it provides — and what most people actually need before deciding whether to book a doctor — is informed perspective on what your symptoms could mean, how urgent they are, and what to watch for.
How the Dr. Khan AI Symptom Checker works
1. You describe what you are feeling
In your own words, in any language the AI understands. You do not need to know the medical name for a symptom. “My stomach has been hurting after meals for a week” is enough to start. The conversation includes your age and biological sex (entered once, used only for medical context, never stored).
2. The AI asks the right follow-up questions
For a headache, that means severity on a 1–10 scale, location, triggers, what makes it better or worse, and whether any other symptoms are present. For a stomach symptom, it asks about timing in relation to food, recent diet changes, accompanying nausea or fever. Each question narrows the picture. You answer at your own pace.
3. The AI checks for red-flag patterns first
Before anything else, the system scans your description for emergency indicators — chest pain with radiation, sudden severe headache, stroke signs, breathing difficulty, severe bleeding, anaphylaxis, suicidal thoughts. If any are present, the response leads with “call emergency services or go to the ER now” and stops the routine flow. Safety first, always.
4. You get a structured assessment
What the AI is hearing in plain language. Possible considerations (never phrased as a diagnosis). Urgency — whether this looks routine, worth monitoring, worth a same-week appointment, or worth same-day care. Specific next steps you can take. Red flags to watch for that would change the picture.
5. You decide what to do next
Every response ends with the same honest reminder: discuss this with a qualified doctor before acting on it. Dr. Khan AI is the conversation before the conversation — not a replacement for the one with a real clinician.
What symptoms can you check?
Anything you can describe in words. The chat handles symptoms across every major body system. Below is a non-exhaustive map of what people most often ask about — click any category to start a conversation about it.
General & systemic
Whole-body signals that often need context to interpret.
- ·Fatigue
- ·Fever
- ·Chills
- ·Unexplained weight loss
- ·Night sweats
- ·Loss of appetite
- ·Swollen lymph nodes
Pain
Where, how often, and how it feels matter as much as how severe.
- ·Headache
- ·Migraine
- ·Chest pain
- ·Abdominal pain
- ·Back pain
- ·Joint pain
- ·Muscle aches
Respiratory
Symptoms involving the airways, lungs, or breathing.
- ·Cough (dry or productive)
- ·Shortness of breath
- ·Wheezing
- ·Sore throat
- ·Nasal congestion
- ·Sinus pressure
Digestive
Gut and metabolism — frequently shaped by diet, stress, and medication.
- ·Nausea
- ·Vomiting
- ·Diarrhea
- ·Constipation
- ·Heartburn / reflux
- ·Bloating
- ·Blood in stool
Neurological
Brain, spine, and nerves — many of these need urgent evaluation if sudden.
- ·Dizziness or vertigo
- ·Numbness or tingling
- ·Tremor
- ·Memory changes
- ·Sudden weakness
- ·Visual disturbances
- ·Seizures
Skin, hair, and nails
Visual — the Photo Consult mode handles these better than text alone.
- ·Rash
- ·Itching
- ·Hives
- ·Hair loss
- ·Acne
- ·Mole changes
- ·Slow-healing wounds
Mental and emotional
Often overlap with sleep, energy, and physical symptoms.
- ·Anxiety
- ·Persistent low mood
- ·Insomnia
- ·Concentration difficulty
- ·Panic attacks
- ·Stress
Urinary and reproductive
The chat handles these directly and discreetly — anonymity makes it easier to ask.
- ·Painful urination
- ·Frequency changes
- ·Menstrual irregularity
- ·Pelvic pain
- ·Sexual health questions
Don’t see your symptom? The list above is a starting map, not a wall. The chat handles anything you can describe — the more specific you are, the better the assessment. Start the conversation and type whatever is on your mind.
When to use the symptom checker — and when not to
Good fit
- You have a symptom and want to understand what it might mean before booking an appointment
- You want a second perspective after a doctor visit and are not sure what was explained
- You are caring for a family member and want to know how urgent something is
- You have a question about a medication side effect or interaction
- You want to understand a lab result you just received
- You are deciding whether to use urgent care or wait until morning
Bad fit
- You are having a medical emergency (see the red-flag list below)
- You need a prescription — the AI cannot write one
- You need a sick note, work excuse, or documentation
- You need a referral to a specialist
- You want a second opinion on a complex chronic condition — that needs a real specialist
- You are looking for a final answer, not informed perspective
When to call emergency services
Do not use the symptom checker first if any of the following are present. Call your local emergency number or go to the nearest emergency room immediately.
- ●Crushing chest pain or pain that radiates to your arm, jaw, or back
- ●Sudden severe headache ("worst headache of your life")
- ●Face drooping, arm weakness, or slurred speech (stroke warning signs)
- ●Difficulty breathing or unable to speak in full sentences
- ●Heavy bleeding that does not stop with pressure
- ●Loss of consciousness, even briefly
- ●Severe allergic reaction — throat swelling, widespread hives, drop in blood pressure
- ●Suicidal thoughts or thoughts of harming yourself or others
- ●High fever in an infant under 3 months old
- ●Sudden severe abdominal pain, especially with vomiting blood or rigid abdomen
United States: 911 · United Kingdom: 999 · European Union: 112 · Australia: 000 · India: 108
If you are unsure whether something is an emergency, err on the side of calling. Emergency services exist to be wrong about and would rather hear from you in a non-emergency than not hear from you in a real one.
Accuracy, safety, and honest limits
Dr. Khan AI is built on large language models trained on peer-reviewed medical literature, current clinical guidelines (AHA, AMA, CDC, WHO, and major specialty societies), and standard evidence-based practice patterns. It is materially more useful than typing your symptom into a search engine because it asks the structured follow-up questions that change the picture, and it reasons across your answers.
It is also not a doctor. No AI today is. The model is explicitly instructed never to diagnose, never to prescribe, never to give specific medication dosages. It frames possibilities, not certainties. When the picture is unclear, it says so. When something looks urgent, it says that loudly and directs you to in-person care.
The honest framing is this: an AI symptom checker is closer to the quality of input a thoughtful friend who is medically literate would give you, than to the quality of input a board-certified specialist examining you in person would give you. That gap matters. It is also dramatically more useful than the gap between Googling your symptom and having any guidance at all.
Symptom checker vs Googling vs ER vs telehealth
Each option has its place. Knowing which one fits the moment is most of the value.
| Option | Best for | Cost | Privacy | Speed |
|---|---|---|---|---|
| Dr. Khan AI | Informed perspective on a symptom before deciding | Free | Anonymous, no data stored | Seconds |
| Googling | Definitions, basic education | Free | Tracked by search history | Seconds — but unreliable |
| Telehealth visit | Prescription, sick note, referral | $30–$100+ per visit or insurance | Medical record kept | Minutes to hours wait |
| Urgent care | In-person exam, basic tests, minor procedures | $100–$300+ visit | Medical record kept | 30 min–3 hr wait |
| Emergency room | Life-threatening symptoms, severe injury | $1,000+ even with insurance | Medical record kept | Triaged immediately if true emergency |
Privacy is the whole point
Most symptom checkers ask you to register before they will talk to you. Many sell the resulting data to advertisers, insurance companies, or research partners. Some store it indefinitely under terms most users never read.
Dr. Khan AI does not do any of that. We do not collect names, emails, phone numbers, IP addresses tied to your conversation, or any other identifying information. Sessions are ephemeral — when you close the tab, the conversation is gone from our side. There is nothing on our servers to leak, breach, subpoena, or sell.
The architecture is detailed in our privacy policy. But the short version is the title of this section: privacy is not a feature, it is the whole point.
Frequently asked questions
Is the Dr. Khan AI Symptom Checker free?
Yes — completely free, with no signup, no credit card, and no premium gate. The product is built around the privacy-first thesis that the most accessible medical guidance is the one nobody has to register for. Daily usage limits exist to prevent abuse but the limits are generous for normal personal use.
Do I have to create an account?
No. Dr. Khan AI never asks for your name, email, phone number, address, or any other identifying information. You start the symptom check by entering your age and biological sex (used only for medical context, not stored) and go straight to the conversation.
Is my conversation private?
Yes. We do not store conversations on our servers. Each session is ephemeral — when you close the tab, the conversation is gone. We do not sell data because there is no data to sell. The privacy claim is architectural, not just a policy promise.
How accurate is the symptom checker?
Dr. Khan AI uses large language models trained on peer-reviewed medical literature and clinical guidelines (AHA, AMA, CDC, WHO standards). It is materially more useful than Googling symptoms because it asks structured follow-up questions and reasons across multiple inputs. However it is not a diagnosis. The system explicitly never diagnoses or prescribes — it provides educational guidance and tells you when you should see a real doctor.
When should I NOT use the symptom checker?
Any medical emergency. Chest pain that radiates, sudden weakness or facial droop, difficulty breathing, severe bleeding, loss of consciousness, signs of stroke, severe allergic reaction, suicidal thoughts — all of these warrant calling emergency services immediately, not opening a chat. The symptom checker itself recognizes most emergency phrasing and will tell you to seek immediate care, but do not rely on it as the first step in an actual emergency.
Can the symptom checker diagnose me?
No, and it never will. Diagnosis is a legal and clinical process that requires a licensed physician, often physical examination, and sometimes laboratory testing. The symptom checker offers possible considerations, risk-level guidance, and a clear recommendation about whether and how urgently to see a doctor. The disclaimer at the end of every session is honest about this.
What if my symptom is rare or unusual?
The chat handles rare symptoms the same way it handles common ones — by asking structured follow-up questions and reasoning across your answers. For genuinely rare conditions the response may be more tentative and lean harder toward "see a specialist." The model is honest when uncertainty is high.
How does this compare to WebMD or Ada Health?
WebMD is a content library; you read articles about symptoms. Ada is a structured decision tree with an account requirement. Dr. Khan AI is conversational — you describe symptoms in your own words, the AI asks follow-up questions, and the conversation adapts in real time. You never sign up. We never store anything.
Can I use this for my child or family member?
Yes. Mention that you are asking about someone else and include their age and relevant context. The chat will scope its response accordingly. For infants, very young children, or anyone medically fragile, the chat will lean strongly toward "consult a pediatrician or primary care provider" rather than self-management.
Does the symptom checker work in other languages?
Yes. Dr. Khan AI detects the language you write in and responds in the same language. Spanish is fully supported with a dedicated landing page at /es/. Other languages work but the medical terminology localization may be less polished than English or Spanish.
Ready to check a symptom?
Start a free, anonymous conversation. No signup, no data stored, no credit card. Dr. Khan AI is ready when you are.
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