Exercise induced muscle weakness in a young adult: McArdle’s disease unusual presentation Authors Hira Kalsoom Combined Military Hospital, Lahore Medical College, Lahore, Pakistan Haseeb Mukhtar Combined Military Hospital, Lahore Medical College, Lahore, Pakistan Rizwana Kitchlew Latif Combined Military Hospital, Lahore Medical College, Lahore, Pakistan DOI: https://doi.org/10.47391/JPMA.8401 Keywords: Glycogen Storage Disease Type V, Myoglobinuria Abstract McArdle’s disease (Glycogen storage disease type V) is a rare inherited autosomal recessive disease involving defect in enzyme, glycogen phosphorylase (PYGM) which results in accumulation of glycogen mainly affecting skeletal muscles. It commonly presents in childhood and rarely in adults with symptoms like exercise intolerance, muscle weakness, cramps and fatigue. Herein, we report an unusual case of a 22 years old male in Pakistan with probable McArdle’s Disease presenting with repeated episodes of generalized cramping muscle pain, exercise intolerance and haematuria. The diagnostic approach to identifying this disease as well as the differentials of other rare types of skeletal muscle disorders that should be kept in mind while dealing with a similar clinical picture, irrespective of the age of presentation, have been discussed. Keywords: Glycogen Storage Disease Type V, Myoglobinuria. Downloads Full Text Article Published 2023-11-28 How to Cite Kalsoom, H., Haseeb Mukhtar, & Rizwana Kitchlew Latif. (2023). Exercise induced muscle weakness in a young adult: McArdle’s disease unusual presentation. Journal of the Pakistan Medical Association, 73(12), 2473–2475. https://doi.org/10.47391/JPMA.8401 More Citation Formats ACM ACS APA ABNT Chicago Harvard IEEE MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Issue Vol. 73 No. 12 (2023): DECEMBER Section CASE REPORT License Copyright (c) 2023 Journal of the Pakistan Medical Association This work is licensed under a Creative Commons Attribution 4.0 International License.