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Cerebral Venous Sinus Thrombosis (CVST): Symptoms, Causes, Treatment & Recovery

Cerebral Venous Sinus Thrombosis (CVST)

Medically reviewed by Dana Angelini, MD, Cleveland Clinic — May 11, 2026

Download the Resource PDF: CVST Symptoms, Causes, Treatment & Recovery

What Is CVST?

Cerebral venous sinus thrombosis (CVST) is a rare but serious type of blood clot that forms in the brain’s veins, which help drain blood from the brain back to the heart. When a clot blocks these veins, it can lead to increased pressure in the brain, swelling, brain tissue injury, or bleeding.

Symptoms of CVST

CVST symptoms can vary from person to person, depending on the size of the clot and how much it interferes with normal blood flow. Symptoms may develop over hours or days. Prompt medical evaluation is critical.

Common symptoms include:

Severe headache (present in up to 90% of cases)
Seizures
Nausea or vomiting
Blurred vision
Weakness or numbness, often on one side of the body
Difficulty speaking or understanding speech
Loss of consciousness or coma
Confusion

Who is at Risk for CVST?

CVST occurs more often in women than in men. While CVST can occur at any age — including in infants and children — it is most commonly diagnosed in adults between the ages of 20 and 40.

Risk Factors

Several factors can increase the risk of developing CVST. It’s important to note that CVST can occur even in the absence of these risk factors:

Hormonal factors: Use of oral contraceptives, pregnancy, and the postpartum period
Inherited clotting disorders: Such as factor V Leiden, prothrombin G20210A, protein C/S deficiencies, and antithrombin deficiency
Chronic inflammatory diseases: Including lupus and inflammatory bowel disease
Infections: Particularly of the ear, face, or neck
Head trauma or recent neurosurgery
Dehydration, especially in infants and young children
Obesity
Certain cancers

Diagnosis

Early and accurate diagnosis is essential to initiate appropriate treatment and reduce the risk of complications. Diagnosing CVST typically involves:

Imaging tests: MRI with magnetic resonance venography (MRV) or CT with CT venography (CTV) to visualize blood flow in the brain’s venous system
Blood tests: To identify clotting disorders or underlying conditions

Treatment

The primary treatment for CVST is anticoagulation therapy (or “blood thinners”) to prevent further clotting and allow the body to dissolve the existing clot. This may include:

Unfractionated Heparin (UFH): Administered intravenously in the hospital setting
Low Molecular Weight Heparin (LMWH): Can be self-administered at home via injection
Warfarin or direct oral anticoagulants (DOACs): Oral medications for long-term management. Typically, IV or subcutaneous anticoagulation is used until the patient is clinically stable prior to a transition to oral blood thinners.

In severe cases, additional interventions may be necessary:

Thrombolytic therapy: Medications to dissolve clots
Mechanical thrombectomy: Catheter-based procedure used to remove clots from blocked arteries or veins
Management of increased intracranial pressure: Including medications or surgical procedures
Antibiotics: If an infection caused the clot

Treatment duration varies based on individual risk factors and response to therapy.

Outlook

With prompt diagnosis and treatment, many individuals recover fully from CVST. However, some may experience long-term neurological issues, such as persistent headaches, fatigue, vision problems, mood changes including depression and anxiety, or cognitive difficulties.

Regular follow-up with healthcare providers is crucial to monitor recovery and manage any ongoing symptoms.

Prevention

While not all cases of CVST are preventable, certain measures can reduce risk:

Managing underlying health conditions: Such as clotting disorders or chronic inflammatory diseases
Staying hydrated, especially during illness or hot weather
Discussing contraceptive options: With a healthcare provider, particularly if you have other risk factors
Avoiding smoking, which can increase clotting risk