Fatigue in MS is different from ordinary tiredness — it is a neurological fatigue that disproportionately limits activity and does not respond to rest in the way normal tiredness does. For someone with MS fatigue, the physical effort of rising from a standard chair is a real energy expenditure that accumulates over the course of a day. A riser chair eliminates this energy cost for one of the most frequently repeated daily activities. For people who use a riser chair many times a day, the cumulative energy saving is meaningful in terms of what they can do with the rest of their available energy.

Spasticity — involuntary muscle stiffness and spasms — is common in MS and affects how the person sits and whether certain positions trigger or ease spasms. The ability to adjust the chair's position continuously is important for MS users who may need to change from a more upright to a more reclined position as spasticity varies through the day. A dual motor riser recliner, allowing independent backrest and footrest adjustment, provides the range of positions needed to manage variable spasticity.

Heat affects MS symptoms in complex ways. Some people with MS experience worsening of neurological symptoms with heat (Uhthoff's phenomenon), while others find that localised warmth to stiff, spastic muscles provides relief. For those in the latter category, a heat function in the chair is a useful comfort feature. Those whose symptoms worsen with heat should avoid heat functions — the majority of chairs allow the heat to be turned off when not wanted.

MS is a qualifying chronic condition under HMRC Notice 701/7. Zero VAT applies. On a £1,500 chair this saves £300. Self-declare at purchase.