Total 21 clinical symptoms reported for Hereditary hyperekplexia  Very Frequent (13)Occasional (4)Frequent (4)

Abnormality of movement	An abnormality of movement with a neurological basis characterized by changes in coordination and speed of voluntary movements.   Synonyms:Abnormality of movement; Movement disorder; Unusual movement	Very frequent
Ataxia	Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).   Synonyms:Cerebellar ataxia	Very frequent
Esophagitis	Inflammation of the esophagus.   Synonyms:Inflammation of the esophagus; Oesophagitis	Very frequent
Fasciculations	Fasciculations are observed as small, local, involuntary muscle contractions (twitching) visible under the skin. Fasciculations result from increased irritability of an axon (which in turn is often a manifestation of disease of a motor neuron). This leads to sporadic discharges of all the muscle fibers controlled by the axon in isolation from other motor units.   Synonyms:Fasciculation; Muscle fasciculation; Muscle twitch	Very frequent
Gastroesophageal reflux	A condition in which the stomach contents leak backwards from the stomach into the esophagus through the lower esophageal sphincter.   Synonyms:Acid reflux; Acid reflux disease; Gastro-esophageal reflux; Gastroesophageal reflux disease; GERD; Heartburn	Very frequent
Hiatus hernia	The presence of a hernia in which the upper part of the stomach, i.e., mainly the gastric cardia protrudes through the diaphragmatic esophageal hiatus.   Synonyms:Hiatal hernia; Stomach hernia	Very frequent
Hyperreflexia	Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.   Synonyms:Increased deep tendon reflexes; Increased reflexes	Very frequent
Hypertonia	A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.   Synonyms:Hypertonicity; Increased muscle tone	Very frequent
Joint stiffness	Joint stiffness is a perceived sensation of tightness in a joint or joints when attempting to move them after a period of inactivity. Joint stiffness typically subsides over time.   Synonyms:Joint stiffness; Stiff joint; Stiff joints	Very frequent
Muscle stiffness	A condition in which muscles cannot be moved quickly without accompanying pain or spasm.	Very frequent
Myoclonus	Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.   Synonyms:Myoclonic jerks	Very frequent
Rigidity	Continuous involuntary sustained muscle contraction. When an affected muscle is passively stretched, the degree of resistance remains constant regardless of the rate at which the muscle is stretched. This feature helps to distinguish rigidity from muscle spasticity.   Synonyms:Muscle rigidity; Rigidity	Very frequent
Spasticity	A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.   Synonyms:Involuntary muscle stiffness, contraction, or spasm; Muscle spasticity; Muscular spasticity	Very frequent