What symptom commonly occurs during the tonic phase of a seizure?

The tonic phase of a seizure is characterized by sustained muscle contraction and rigidity. During this phase, the body's muscles stiffen, leading to an intense contraction that may cause the individual to fall or be unable to control their limbs. This rigidity can result in various physiological responses from the body. Incontinence, particularly, is a symptom that can manifest during this phase due to a combination of muscle contraction and relaxation control loss. The sudden and intense muscle contractions may lead to involuntary expulsion of urine or feces.

While other symptoms such as muscle spasms and loss of motor control can be associated with different phases of a seizure, the primary feature of the tonic phase is the continuous muscle tension. Visual disturbances often happen during different phases or types of seizures but are not specific to the tonic phase itself. Hence, the occurrence of incontinence is notably tied to the intense muscle control loss present during the tonic phase, making it a relevant symptom in this context.