Hamilton Anxiety Rating Scale (HAM-A)

The HAM-A is a 14-item scale a clinician rates in an interview to measure how severe anxiety is. Each item scores 0 to 4, for a total from 0 to 56, split into psychic and somatic anxiety. See what each score means, how to read the two subscores and track change, and record the rating with the free template. The official form comes from its publisher.

  • Score bands explained
  • Recording template to copy
  • Two recorded examples

HAM-A result template

Free
HAMILTON ANXIETY RATING

Rating date: [Date]
Patient: [Name or record number, age]
Rater: [Name, role, and HAM-A training]
Interview: [Unstructured or SIGH-A guide; in person or video; minutes taken]
Period rated: [Past week, or the period your protocol sets]
Condition tracked: [Generalized anxiety disorder, panic disorder, health anxiety, mixed anxiety and depression, or other]

ITEM RATINGS
Items 1 to 14: [Each rating 0 to 4, in order]
Rated 3 or 4: [Symptom areas rated severe or very severe]

TOTALS
HAM-A total: [0 to 56]
Severity band: [Mild 0-17, mild to moderate 18-24, moderate to severe 25-30, or severe 31-56; name the set if different]
Psychic subscore: [Items 1 to 6 and 14, out of 28]
Somatic subscore: [Items 7 to 13, out of 28]

SINCE BASELINE
Baseline rating: [Date, total, subscores, and who rated it]
Change: [Points and percent; response at a 50% fall, remission at 7 or less]
Same rater and method: [Yes, or what changed]

CONTEXT
Physical causes checked: [Thyroid, heart, lungs, caffeine, alcohol, stimulants, side effects of current medicines]
Mood and safety: [Depression rating or screen, suicide risk]
Patient's account: [Self-report scores such as the GAD-7, and what the patient says has changed]

DECISION
Treatment: [Continue, raise dose, switch, add therapy, or step down]
Referral: [Psychology, psychiatry, medical workup, or none]
Next HAM-A: [Date or weeks from now, same rater if possible]

Rated by: [Clinician name, credentials]

Get the official HAM-A from its source.

Who holds it

Max Hamilton, from his 1959 paper in the British Journal of Medical Psychology. ePROVIDE lists the copyright with The British Psychological Society, managed by Wiley.

How you may use it

The scale is copyrighted. Check the terms with the rights holder before you reprint it, put it online, or build it into software or a study; this page doesn’t reproduce the items or their descriptions. ePROVIDE lists the scale, its translations, and the contact for permission.

Use it for

  • Anxiety clinics
  • Psychiatry follow-up
  • Medication reviews
  • Clinical trials
  • Research interviews

What the score means. 0 to 56.

0 to 17: Mild

Mild anxiety at most; totals of 7 or less are usually read as little or none. Decide on treatment from the interview and how much the symptoms get in the way.

18 to 24: Mild to moderate

Clear, troublesome anxiety. Agree a plan, usually therapy, medication, or both, and rate again in 4 to 6 weeks.

25 to 30: Moderate to severe

Marked anxiety that affects daily life. Start or step up treatment, and review within a few weeks.

31 to 56: Severe

Severe anxiety. Treat promptly, check for depression, substance use, and suicide risk, and consider specialist or more intensive care.
  • Rate each of the 14 items 0 for not present, 1 mild, 2 moderate, 3 severe, or 4 very severe, from the interview and what you see, then add them for a total from 0 to 56.
  • The psychic subscore adds items 1 to 6 and 14; the somatic subscore adds items 7 to 13. Each runs from 0 to 28.
  • The bands above are the ones most often quoted. Cutoffs vary: a 2010 study in generalized anxiety disorder by Matza and colleagues matched totals to clinicians’ overall ratings and proposed 0 to 7 none or minimal, 8 to 14 mild, 15 to 23 moderate, and 24 or more severe. Say which set you use.
  • Drug trials in generalized anxiety disorder usually enroll people scoring 18 or 20 or more.
  • For follow-up, a fall of 50% or more from baseline is the usual definition of response, and a total of 7 or less of remission; some services use 10 or less.
  • It measures severity in people already known to have anxiety; it wasn’t built to screen or diagnose. Low mood and sleep are rated items, so it rises with depression too, and physical illness and side effects raise the somatic items.
  • A structured interview guide, the SIGH-A, gives set questions for each item and helps raters agree, especially without long joint training. Keep the same method from rating to rating.

How to give it, score it, and read it.

Who rates it

A trained clinician rates the HAM-A from an interview of about 15 to 20 minutes. The patient doesn’t fill it in.

  • Use the official form, with the description it gives for each item
  • Ask the same questions each time, ideally from the SIGH-A interview guide
  • Rate the past week unless your protocol sets another period, and write the period down
  • Rate behavior during the interview, item 14, from what you see, not from what the patient reports

Avoid: Handing the form to the patient to fill in. It’s built for a rater, and a self-rated total can’t be compared with one from an interview.

Scoring

Each of the 14 items is rated 0 to 4 for how severe that symptom area has been. The items add up to a total from 0 to 56.

  • Record every item rating, not only the total
  • Add items 1 to 6 and 14 for the psychic subscore, and items 7 to 13 for the somatic subscore
  • Weigh how often a symptom happens, how intense it is, and how much it gets in the way before you settle on a number

Avoid: Rating an item from a one-word answer. Ask a follow-up question, and an example, before choosing between 2 and 3.

Reading the total

The band shows how severe the anxiety is now. It doesn’t say which anxiety disorder the patient has; the diagnosis comes from the full assessment.

  • Name the set of bands you use: 24 is mild to moderate on the common set and severe on the 2010 Matza set
  • Read the total next to the patient’s own report and how they are managing at work and at home
  • Check for depression at the same visit: low mood and poor sleep raise the HAM-A too

Avoid: Using the HAM-A as a screen. It was built to rate severity once anxiety is known; for a quick screen, the GAD-7 is the usual tool.

Psychic and somatic subscores

The psychic items cover worry, tension, fears, sleep, concentration, low mood, and how the patient seems in the interview. The somatic items cover muscles, the senses, heart, breathing, gut, urinary and sexual symptoms, and signs such as sweating or flushing.

  • Record both subscores, so a reader sees which side is driving the total
  • Before reading a high somatic subscore as anxiety, check for physical illness and medication side effects
  • Watch the somatic subscore in older adults and in health anxiety, where physical symptoms often lead

Avoid: Counting side effects as anxiety. Nausea from an SSRI or sweating on venlafaxine raises the somatic items while the anxiety improves.

Tracking change

Rate it at baseline and at each treatment review, often every 4 to 6 weeks in a clinic, to see whether treatment is working.

  • Have the same rater use the same method each time where possible
  • Work out the change as points and as a percentage of the baseline
  • Read a fall of 50% or more as a response, and a total of 7 or less as remission
  • Change the plan when the total hasn’t reached a response after 8 to 12 weeks at a full dose

Two recorded results. Every part, filled in.

Each one follows the recording template. Use them to judge how much to write.

HAM-A rating: partial response at 12 weeks in an anxiety clinic

Specialty anxiety clinic, 12-week review, rated in person by her psychiatrist with the SIGH-A guide

Item ratings

Items 1 to 14: 2, 2, 0, 1, 2, 1, 2, 0, 1, 0, 1, 0, 1, 1. Nothing rated 3 or 4 today; worry, tension, and sleep were all 3 at baseline.

Totals

HAM-A 14, mild on the common bands. Psychic 9, somatic 5.

Since baseline

Baseline 26 on August 17, moderate to severe: psychic 15, somatic 11, same rater and guide. Down 12 points, 46%: a partial response, just short of the 50% mark and well above remission.

Context

39-year-old woman who runs a bakery, diagnosed with generalized anxiety disorder in August. Venlafaxine XR 75 mg for 12 weeks; blood pressure 124/78. Sleeping 6 to 7 hours now. Still worries most days about cash flow and her son’s asthma, with neck and shoulder tension by evening. GAD-7 15 at baseline, 8 today. PHQ-9 6, item 9 at 0. Thyroid tests normal in August; one coffee a day.

Decision

Venlafaxine XR raised to 150 mg, with a blood pressure check in 2 weeks. Referred to the clinic psychologist for 12 sessions of CBT for generalized anxiety, with relaxation training for the tension. Next HAM-A in 6 weeks with the same rater and guide; the aim is 7 or less.

Common mistakes, and how to avoid them.

Using it as a screen

The HAM-A rates severity once anxiety is known, and it takes a trained rater. Screen with a short self-report such as the GAD-7, then rate with the HAM-A if you need a clinician’s measure.

Changing rater or method midway

Different raters, and a structured guide against a free interview, can shift the total by a few points. Note who rated it and how, and keep both the same where you can.

Reading every somatic point as anxiety

Heart, lung, and thyroid disease, and side effects of medicines, all raise items 7 to 13. Check for them, and record the subscores, so the total isn’t misread.

Quoting a band without its set

Two sets of bands are in wide use, and they disagree in the middle. A total of 24 is mild to moderate on one and severe on the other, so name the set in the note.

Say the rating. Review the note.

Vero Scribe records the HAM-A rating in your template from the visit, with the patient’s consent, or from your dictation: the total, the psychic and somatic subscores, the change since baseline, and your decision. You review and edit every line, then copy it into your record. Vero works in 60+ languages.

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Frequently asked questions.

How do you score the Hamilton Anxiety Rating Scale?

A clinician rates each of the 14 items from 0 for not present to 4 for very severe, using the descriptions on the official form, then adds them. The total runs from 0 to 56. Items 1 to 6 and 14 make the psychic subscore, and items 7 to 13 the somatic subscore, each out of 28.

What do HAM-A scores mean?

The bands most often quoted are 17 or less mild, 18 to 24 mild to moderate, 25 to 30 moderate to severe, and 31 or more severe. Cutoffs vary: a 2010 study in generalized anxiety disorder proposed 7 or less as none or minimal, 8 to 14 mild, 15 to 23 moderate, and 24 or more severe. State which set you use.

What counts as a response or remission on the HAM-A?

A fall of 50% or more from the baseline total is the usual definition of response. A total of 7 or less is the usual definition of remission, though some services use 10 or less. Compare ratings made by the same rater with the same method.

What’s the difference between the HAM-A and the GAD-7?

The GAD-7 is 7 questions the patient answers alone in a couple of minutes, scored 0 to 21, and it’s used to screen and track anxiety. The HAM-A is 14 items a clinician rates in an interview, scored 0 to 56, with much more on physical symptoms. It’s used mainly in specialty care and research to measure severity and change.

How does it differ from the Hamilton Depression Rating Scale?

Max Hamilton wrote both. The depression scale, published in 1960, rates depression severity from an interview in the same way. They overlap: each has items on anxiety, sleep, and low mood, so the totals tend to rise and fall together, and many clinics rate both.

Who can give the HAM-A, and how long does it take?

A clinician trained to rate it: a psychiatrist, psychologist, mental health nurse, or trained research rater. The interview takes about 15 to 20 minutes. The SIGH-A interview guide gives set questions for each item and helps different raters agree.

Is the HAM-A free, and where do I get the form?

The scale was published in Hamilton’s 1959 paper, and ePROVIDE lists the copyright with The British Psychological Society, managed by Wiley. Check the terms there before you reprint it or use it in software or a study. The recording template on this page is free to copy or download.

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