Primary Lateral Sclerosis
Living well with PLS — honest information, built on the evidence
Primary Lateral Sclerosis is a rare upper motor neuron disease. It progresses slowly — most people with PLS live for decades after diagnosis. This guide exists because the gap between what neurologists know and what patients can find online is too wide. Every page is built from peer-reviewed research, clinical guidelines, and patient experience.
What this guide covers
Five areas, written for people living with PLS
Understanding PLS
What Primary Lateral Sclerosis is, how it is diagnosed, what the 2020 consensus criteria require, and — most importantly — what the research says about prognosis and life expectancy.
Living with PLS
The daily reality. Spasticity is the dominant symptom — this section covers how to manage it and everything else: mobility, speech, emotional changes, exercise, and daily living strategies that preserve independence.
Treatment & care
There are no disease-modifying drugs for PLS yet — but there is a lot that helps. This section covers symptom-targeted treatments, why a multidisciplinary care team matters, and what clinical trials exist for PLS.
Research library
A curated, updated collection of PLS research. Natural history studies, biomarker work, spasticity trials, genetics, and emerging therapies. Plain-language summaries with links to the primary literature.
Support
Practical guidance for caregivers (PLS caregiving looks nothing like ALS caregiving — the timeline is decades), patient communities, and a context page on ALS for anyone who wants to understand the broader MND spectrum.
Where to start
If you have just been diagnosed
Read Prognosis & life expectancy first. It is the most important thing to understand early: PLS is a slow disease, and the picture for long-term survival is far better than most patients realise when they first hear the words "motor neuron disease."
Then read What is PLS? and Diagnosis for the clinical picture, and PLS vs ALS to understand why your neurologist may take several years to be sure of the diagnosis.
For day-to-day questions, Spasticity management is where most PLS patients find the information that actually changes their life.
About this guide
Built on evidence, written for people
This site was built because PLS is a drastically under-served condition online. Most "motor neuron disease" content is about ALS — a different disease with a different prognosis and different daily realities. The research literature on PLS is scattered across clinical journals and rarely reaches patients in a form they can actually use.
The guide draws on 1,186 research sources — PubMed studies, clinical guidelines, natural history cohorts, and expert consensus documents — synthesised into plain language with the underlying evidence preserved. The Research Library is updated as new studies appear.
This guide is not a substitute for medical care. Diagnosis and treatment require a qualified neurologist. What it can do is help you arrive at those conversations better informed.