Hurtl
How to Track Ankylosing Spondylitis Symptoms Between Appointments
By Tom, founder of Hurtl.
Rheumatology appointments for ankylosing spondylitis are usually months apart. In that gap, inflammatory back pain can shift, morning stiffness can lengthen, and fatigue is easy to underreport in hindsight. We remember the worst day or the most recent one, not the honest average across twelve weeks.
Tracking ankylosing spondylitis symptoms is one way to close that gap — not to replace your clinician’s judgement, but to walk in with a clearer picture than guesswork allows.
Ankylosing spondylitis (AS) is a form of axial spondyloarthritis (axSpA). The symptoms worth logging are largely the same either way. This guide is written from the patient’s side of the chair. None of it is medical advice.
Why tracking AS symptoms matters between appointments
“How have you been since I last saw you?” is a hard question when the answer covers three months of fluctuating pain, stiffness and energy. Recency bias fills in the blanks: yesterday’s flare becomes the whole story, or a good week makes you downplay a rough month.
A short, consistent log turns that into something your rheumatologist can actually use. Not a performance review — a timeline. You can see when stiffness lasted longer in the mornings, when spinal pain crept up, or whether a treatment change lined up with anything.
If you want more on building the habit without burnout, see why track symptoms — even when there isn’t a straight answer.
The symptoms worth tracking
You do not need a perfect dataset. You need a few repeatable signals logged often enough to show a trend. For most people with AS, the high-value ones are:
- Pain — spinal and inflammatory back pain, including location, intensity and timing. Pain that eases with movement rather than rest is a pattern worth noting over weeks, not just on the day of clinic.
- Morning stiffness — how bad it feels and how long it lasts after waking. Duration is often more telling than a single severity rating.
- Fatigue — common, easy to forget between visits, and hard to reconstruct from memory.
- Sleep — how well you slept, and whether pain or stiffness interrupted it. Sleep and next-day stiffness often move together.
- Mobility and function — bending, walking, getting out of bed, or daily tasks that got harder. Small week-to-week changes can signal a flare building.
- Peripheral joint symptoms — pain or swelling outside the spine, plus tender spots (enthesitis) such as heels or chest wall. These are part of the AS picture even when the back is the main complaint.
- Flares — mark harder days, even with a simple yes/no. Over months, frequency and recovery time become visible.
Logged consistently, these turn “my back has been bad” into “spinal pain sat at 5–7 most mornings in June; stiffness lasted over an hour on weekdays; I had four flare days after I missed NSAIDs twice.” Same story — but one your rheumatologist can act on.
Start smaller than you think
Demanding completeness is one of the fastest ways to quit. A sustainable habit usually means:
- Low friction — entries you can finish in under a minute
- Consistent anchors — the same few signals each time, not everything imaginable
- A purpose — you are collecting information for a question, such as “Is this new biologic helping after eight weeks?” or “Did stiffness lengthen before the last flare?”
You do not need to log every symptom every day. Several entries per week with the same signals is often enough to see a pattern before your next visit.
Don’t just record severity — record change
A pain rating of 6/10 on appointment day is one data point. What helps more is direction:
- Is morning stiffness lasting longer than it did in March?
- Did fatigue ease in the weeks after a treatment change, then creep back?
- Are flares more frequent, or are they taking longer to settle?
Write a line about what was different when you can. Trends — not a single snapshot — are what turn a status report into a useful clinical conversation.
Track medication alongside symptoms
Starting an NSAID, adjusting a dose, or beginning a biologic? Adherence and symptom trends together show whether treatment is helping over weeks — not just whether you feel better today.
Note doses taken and missed doses with a brief reason when you can (“forgot”, “side effects”, “ran out”). Your rheumatologist needs that context to judge whether a drug is failing or never got a fair trial.
How often should you record symptoms?
Daily is ideal if the entry stays short. Several consistent days per week is still useful. What is not useful is logging intensively for five days, then nothing for a month.
Aim for a rhythm you can keep until the next appointment — or at least through a treatment-change window of six to eight weeks. Skip days without shame. Missing data is data about life happening.
Using BASDAI to measure disease activity
BASDAI (Bath Ankylosing Spondylitis Disease Activity Index) is the score most rheumatologists use for AS and axSpA. It combines six questions — fatigue, spinal pain, peripheral joint pain, enthesitis, and morning stiffness severity and duration — into a single number from 0 to 10.
You do not need to complete the full questionnaire every day. Logging those underlying symptoms regularly gives a more accurate picture than trying to recall how the past month felt from memory.
Use the free BASDAI calculator to estimate a score from the six standard questions, or read what BASDAI is and how it is calculated. A single score is a snapshot; trends matter more. Interpretation belongs with your rheumatologist.
Hurtl can estimate BASDAI from daily logs — an estimate from your entries, not an official clinical score.
What to bring to your rheumatology appointment
Clinicians have limited time. A 40-page diary is hard to use; a one-page summary of trends since your last visit is gold.
For a broader checklist — questions to ask, what to bring, how to frame change — see how to prepare for a rheumatology appointment.
A simple pre-visit checklist for AS:
- Symptom trends since the last visit (pain, stiffness, fatigue, sleep, mobility)
- Flare days noted — dates if you have them
- Medication list + any missed doses and why
- BASDAI or score trend, if you have been measuring it
- Your top three questions, written down
- A pen — to note what your clinician says
Framing your update around change — not just how you feel today — is what turns a status report into a useful clinical conversation.
Using an AS symptom tracker
A dedicated tracker keeps the signals above in one place: daily logs, flare marks, medication adherence, and a report you can export for clinic.
See our ankylosing spondylitis symptom tracker if you search or identify with the AS label, or the axial spondyloarthritis tracker for the broader umbrella term. Both support the same kind of logging. You can also try the BASDAI calculator first if you want a score before you start a daily habit.
Where Hurtl fits
Hurtl is built for inflammatory conditions, including ankylosing spondylitis and axial spondyloarthritis. You log symptoms in under a minute a day, see a BASDAI estimate and visit prep summary on the Condition tab, and export a clinical PDF for the period you choose — symptom charts, flare history and medication adherence in one report.
It is not a medical device and it does not diagnose or treat anything. It simply helps you walk in with data instead of trying to reconstruct three months from memory.
Hurtl is available on iPhone, with Android on the way.