The most common symptom at onset is a positional headache that is worse with upright posture and improved with horizontal positioning. Headache is not always present and varies a great deal in severity and characteristics.
More common symptoms include nausea (with or without vomiting), neck pain or stiffness, pain between shoulder blades, arm pain, dizziness, imbalance, sensitivity to light or sound, hearing changes such as muffled hearing or ringing and changes in the ability to think clearly.