The best replacement for gravis is als.

The best alternatives to gravis are rated as following:
★★★★★  als
★★★★★  multiple sclerosis
★★★  muscular dystrophy
★★★  guillain barre
★★★  lambert eaton
★★★  cholinergic crisis
★  botulism
★  bell's palsy
★  lambert-eaton syndrome
★  lambert eaton syndrome
★  polymyositis
★  myotonic dystrophy
  guillain barre syndrome
  gbs
  myasthenic syndrome

Your alternative for gravis is not listed? Suggest!
Speaking about gravis, one probably shouldn't forget about thymoma.

Other search terms related to gravis and their ratings are:
★★★★★ thymoma
★★ eye involvement
★★ ptosis
★ respiratory failure
★ thymectomy
You have in mind a companion for gravis and it is not yet here? Propose!



Google Trends

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gravis
als
multiple sclerosis