Taking into account your young age, and the rarity of ALS, I would say naaaah! The odds of you having ALS are extremely low, and ALS is definitely NOT the 1st possibility to think of. Muscle cramps are very common and usually affect a single lower extremity, mainly involving the calf muscles.
Here’s what I recommend you should do:
For reassurance, take a serum electrolytes (BUN, creatinine,
calcium, magnesium) levels; if you have deficiency, then you will need
supplementation – talk with your doctor for this matter.
A few tips that could also help include:
- Passive
stretching and massage of the affected muscle: this will help ease the
pain of an acute attack. So what you need to do is to straighten the
affected leg while bending the ankle upward (dorsiflexion), or heel walk
until the acute pain fades. - Regular
stretching of the calf muscles throughout the day: may help to prevent
acute attacks. You could do stretching three times daily or before going
to bed. - Use a
pillow to raise your feet while you sleep, or raising the foot of the bed,
these may help prevent attacks.
Should your symptoms persist or
worsen, then you should be examined by a physician.