Why Am I So Tired? Understanding Fatigue in Ankylosing Spondylitis
If you’re living with ankylosing spondylitis (AS) and feel exhausted no matter how much you rest, you’re not alone — and you’re not imagining it. Fatigue is one of the most common, and most frustrating, symptoms reported by AS patients.
The encouraging news is that fatigue almost always has an identifiable cause — and many of those causes are treatable. Understanding why you’re tired is the first step toward feeling better.
What Is Ankylosing Spondylitis?
Ankylosing spondylitis is an autoimmune condition in which the immune system mistakenly attacks the body’s own tissues — primarily the joints of the spine. AS can also affect:
- Peripheral joints and tendons
- The cardiovascular system (heart and valves)
- The lungs
Because AS involves ongoing immune system activity, it’s not surprising that fatigue is such a common complaint.
Common Causes of Fatigue in AS Patients
Fatigue in ankylosing spondylitis usually falls into one of several categories. Identifying the right one is key to effective treatment.
1. Active Inflammation
If your AS is currently active — meaning you’re experiencing increased pain, morning stiffness, or other flare-related symptoms — that inflammation alone can cause significant fatigue.
Ask your rheumatologist:
- Is my AS currently active?
- Does my treatment plan need to be adjusted or escalated?
2. Non-Inflammatory Medical Causes
Not every case of fatigue in an AS patient is related to AS itself. Just like anyone else, AS patients can experience fatigue from:
- Thyroid dysfunction
- Low cortisol levels
- Vitamin D or B12 deficiency
- Hormonal changes related to age
These are worth ruling out with basic bloodwork.
3. Medication Side Effects
If you’re on long-term immunosuppressive therapy for AS, fatigue could be a side effect of your medication. Your doctor may want to check:
- Complete blood count (anemia, white blood cell levels)
- Kidney and liver function
- Any other signs of medication-related side effects
4. The Toll of Chronic Illness
Living with a chronic condition is exhausting in itself. Between appointments, lab monitoring, medication management, and simply coping day to day, the mental and physical load of managing AS can contribute significantly to fatigue.
What You Can Do About It
If fatigue is impacting your quality of life, here are some important steps:
- Talk to your rheumatologist about whether your AS is active and whether treatment needs adjusting
- Get basic labs checked — thyroid, vitamin D, B12, cortisol, blood counts, kidney and liver function
- Review your medications for possible side effects
- Support your lifestyle with balanced nutrition, regular exercise, appropriate sleep, and stress management
- Be patient with yourself — managing a chronic illness takes time, and giving yourself grace matters
When to See a Rheumatologist About Fatigue
If your fatigue is new, worsening, or not improving with lifestyle changes, it’s time to have a conversation with a rheumatology specialist. A thorough evaluation can help determine whether your fatigue is related to disease activity, another medical cause, or medication — and guide you toward the right treatment plan.
Take the Next Step Toward Feeling Better
Fatigue doesn’t have to be something you simply “live with.” At Chicago Arthritis, our team specializes in rheumatology and regenerative medicine, helping patients with ankylosing spondylitis and other autoimmune conditions find real answers and effective treatment options.
👉 Visit ChicagoArthritis.com to learn more or schedule a consultation with a Chicago rheumatologist today.
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