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www.reference.com/article/causes-cat-s-head-shake-tremble-f03775bb37792e14

A cat’s head can shake or tremble due to tremors, which are a symptom of an underlying health problem. Tremors occur when the muscles contract and relax involuntarily and repetitively. Tremors in cats can be caused by numerous factors, including inflammation, injury, ne...

www.reference.com/article/could-cause-dog-tremble-dda5ef456874880e

Excitement, old age, pain and nausea are all causes of trembling in dogs, according to WebMD. Trembling or shivering may be a sign of something serious, such as an injury, kidney disease or poisoning.

www.reference.com/article/causes-trembling-hands-714ab5b0aea3b00f

The cause of trembling hands may be essential tremor, certain medications, Parkinson’s disease, liver failure or alcoholism, according to WebMD. Arsenic and mercury poisoning also cause trembling.

www.reference.com/article/medical-causes-trembling-hands-f7f5400126cfa85e

Certain medications, overactive thyroid, brain disorders and excessive alcohol consumption are causes of hand trembling. Other causes include stress, excessive caffeine intake, muscle weakness and stroke, according to MedlinePlus.

www.reference.com/article/causes-trembling-during-sleep-bf7094365a3d18d3

Trembling during sleep, or myoclonus, can be the result of neurological disorders and atrophies, endocrine dysfunction, liver problems, diabetes, neurological injury, or diseases such as Parkinson's or Alzheimer's, notes Mayo Clinic. Alcohol withdrawal or the use of cer...

www.reference.com/article/possible-reasons-trembling-muscles-821d5377b516c95c

Reasons for trembling muscles include muscle fatigue, excessive caffeine intake, high levels of stress, advancement in age and reduced blood sugar levels. Traumatic brain injury, stroke, Parkinson’s disease, multiple sclerosis and excessive alcohol consumption are examp...

www.reference.com/article/illnesses-can-cause-dog-shiver-tremble-e3e1d1a980c4f88b

Dogs may shiver or tremble for many reasons, including pain, poisoning or kidney disease, according to WebMD. Dogs may also shiver due to seizures or other neurological conditions.