Autoimmune inflammatory vasculitis causes inflamed blood vessels that can damage nearly any organ, so symptoms vary widely depending on which vessels are affected and how large they are. Most people experience a combination of whole-body symptoms like fatigue, fever, and unintentional weight loss alongside organ-specific problems in the skin, kidneys, lungs, nerves, or eyes. Because the disease can target small, medium, or large blood vessels, two people with vasculitis may look and feel completely different from each other.
Whole-Body Symptoms That Come First
Before organ-specific damage becomes obvious, vasculitis often announces itself with vague, flu-like complaints. Persistent fatigue, unexplained fevers, night sweats, joint and muscle aches, and weight loss without trying are common early signals. These “constitutional” symptoms reflect widespread inflammation and can persist for weeks or months before a clearer pattern emerges. They’re easy to dismiss or attribute to stress, which is one reason vasculitis is frequently diagnosed late.
Skin Changes
The skin is one of the most visible targets. When small vessels near the surface become inflamed, you may notice palpable purpura: clusters of small, raised reddish-purple spots that don’t fade when you press on them. They tend to appear on the lower legs and feet because gravity pushes blood into the smallest vessels there. Tiny pinpoint dots called petechiae, hive-like patches, and shallow skin ulcers can also develop.
Deeper, medium-to-large vessel inflammation produces different patterns. Livedo reticularis creates a lacy, net-like reddish or bluish discoloration, most often on the legs. Firm, tender nodules can form under the skin. Deep ulcers, particularly on the fingers or toes, point to significant blood flow restriction in those areas.
Kidney Involvement
The kidneys are among the organs most frequently affected, especially in small-vessel forms of vasculitis. In microscopic polyangiitis, for example, kidney damage occurs in roughly 90 percent of patients. The earliest sign is often blood in the urine, which may be visible or only detectable on a lab test. As damage progresses, protein begins leaking into the urine and blood pressure rises. You might not feel kidney involvement at all in the early stages, which is why urine tests are critical for anyone being evaluated for vasculitis. Left untreated, kidney inflammation can progress to permanent loss of function.
Lung and Respiratory Symptoms
Vasculitis involving the lungs can mimic pneumonia, making it tricky to identify. Symptoms include persistent cough, shortness of breath, and coughing up blood. Imaging may reveal what looks like fluid or infection in the lungs, but those “infiltrates” actually represent bleeding from damaged tiny blood vessels. Some forms of vasculitis also cause cavities, or hollow spaces, to develop inside the lungs.
One specific type, eosinophilic granulomatosis with polyangiitis (formerly called Churg-Strauss syndrome), has a distinctive three-stage pattern. It typically begins with allergic nasal inflammation and asthma, progresses to a phase resembling pneumonia, and then enters a stage of full systemic vasculitis. The vasculitis phase usually develops within three years of asthma onset. Heart complications, including inflammation of the heart muscle and the coronary arteries, are the leading causes of serious illness and death in this form.
Nerve Damage
When vasculitis cuts off blood supply to peripheral nerves, the result is vasculitic neuropathy. This typically causes a mix of sensory and motor problems: tingling, numbness, burning pain, and muscle weakness in the limbs. What sets it apart from other neuropathies is its asymmetry. Rather than affecting both hands or both feet equally, it may strike one limb far more severely than the others. A person might develop sudden weakness or numbness in one foot, then weeks later have similar symptoms appear in the opposite hand. This patchy, unpredictable pattern is a hallmark that raises clinical suspicion for vasculitis as the underlying cause.
Eye Symptoms
Several forms of vasculitis can inflame structures inside the eye. Uveitis, inflammation of the middle layer of the eye, causes eye redness, pain, sensitivity to light, and blurred vision. Scleritis, inflammation of the white outer wall of the eye, produces a deeper, boring pain that can radiate into the cheek, brow, or temples, along with a bluish discoloration from engorged blood vessels. Episcleritis is a milder cousin, causing sudden but less intense aching with bright redness that tends to resolve more quickly. Any unexplained eye pain, vision changes, or persistent redness in someone with known or suspected vasculitis warrants prompt evaluation, because some of these conditions can permanently damage vision.
Large Vessel Symptoms
When vasculitis targets the body’s largest arteries, symptoms reflect reduced blood flow to entire regions. Giant cell arteritis, which most commonly affects people over 50, causes a new or unusual headache, tenderness along the temples, and jaw pain that worsens with chewing. The temporal artery may feel tender or have a weakened pulse. Vision loss can occur suddenly if the arteries supplying the eyes become affected.
Takayasu arteritis typically strikes before age 40 and targets the aorta and its major branches. It causes claudication, a cramping pain during activity that results from insufficient blood flow. Upper-limb claudication is more common than lower-limb in this disease. A difference of more than 10 mmHg in blood pressure between the two arms, a weakened pulse in one arm, or a whooshing sound (bruit) heard through a stethoscope over major arteries are characteristic findings. Some patients develop renovascular hypertension when the abdominal aorta narrows near the kidney arteries.
How Symptoms Differ by Vessel Size
The size of the affected blood vessels is the single biggest factor in determining what symptoms appear. Small-vessel vasculitis tends to show up as skin purpura, kidney problems, lung bleeding, and nerve damage. Medium-vessel disease is more likely to cause organ infarction, deep skin ulcers, and aneurysms. Large-vessel disease presents with claudication, pulse deficits, and blood pressure discrepancies between limbs.
Many people have overlap. A condition like granulomatosis with polyangiitis (GPA) can cause sinus and nasal inflammation, lung nodules, kidney damage, skin lesions, and nerve problems all at once. Diagnosis relies on blood tests for specific antibodies (PR3-ANCA and MPO-ANCA), tissue biopsy when possible, and imaging. A positive antibody test strongly supports a diagnosis, but if the test comes back negative and clinical suspicion is still high, additional testing methods are recommended. In practice, vasculitis is often identified not by a single dramatic symptom, but by the unusual combination of problems across multiple organ systems that don’t otherwise fit together.