Are fasciculations in als constant or do they come and go?

Common symptom: Fasciculations are a common symptom of ALS that are usually persistent. Fasciculation potentials can also occur in healthy individuals (e.g. benign fasciculation syndrome). A neurologist can help to determine whether you have fasciculations and if so, whether they are benign or malignant. http://www.nlm.nih.gov/medlineplus/amyotrophiclateralsclerosis.html

Constant: Fasciculations in ALS are basically constant. They are due to loss of nerve input to muscles, and they occur as the muscles lose bulk and strength.