Case Report
Copyright ©The Author(s) 2024. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Feb 16, 2024; 12(5): 1025-1028
Published online Feb 16, 2024. doi: 10.12998/wjcc.v12.i5.1025
Hematuria after nocturnal exercise of a man: A case report
Ming-Jian Bai, Song-Tao Yang, Xue-Kai Liu
Ming-Jian Bai, Xue-Kai Liu, Department of Clinical Laboratory, Aerospace Center Hospital, Beijing 100049, China
Song-Tao Yang, Department of Nephrology, Aerospace Center Hospital, Beijing 100049, China
Author contributions: Bai MJ wrote the manuscript; Yang ST was responsible for receiving patients; Liu XK was responsible for laboratory tests related to patients.
Informed consent statement: Informed written consent was obtained from the patient for publication.
Conflict-of-interest statement: All the authors declare that they have no conflict of interest.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See:
Corresponding author: Xue-Kai Liu, MD, Doctor, Department of Clinical Laboratory, Aerospace Center Hospital, No. 15 Yuquan Road, Haidian District, Beijing 100049, China.
Received: December 10, 2023
Peer-review started: December 10, 2023
First decision: December 18, 2023
Revised: December 28, 2023
Accepted: January 22, 2024
Article in press: January 22, 2024
Published online: February 16, 2024

A man experienced multiple episodes of macroscopic hematuria following nocturnal exercise. Urinary stones and tumors were considered the two most likely causes. The patient had two hobbies: Consuming health care products in large quantities and engaging in late-night running.


Health care products contain a large amount of calcium phosphate, and we hypothesize that this could induce the formation of small phosphate stones. After exercise, the urinary system is abraded, resulting in bleeding. The patient was advised to stop using the health care products. Consequently, the aforementioned symptoms disappeared immediately. However, the patient resumed the above two habits one year later; correspondingly, the macroscopic hematuria reappeared.


This finding further confirmed the above inference and allowed for a new avenue to determine the cause of the patient’s hematuria.

Keywords: Hematuria, Health care products, Exercise, Case report

Core Tip: If patients take a lot of healthcare products containing calcium phosphate, amorphous phosphate crystals may appear in urine. Once they do exercise, they may scratch the urethra and cause hematuria.