A 23-year-old man comes to the emergency department due to 4 days of cramping abdominal pain. He has been feeling weak for the past 2 weeks. He tried over-the-counter antacids without relief. He is an industrial laborer with no significant medical history or known allergies. The patient's parents have hypertension, and his siblings are healthy. Temperature is 37.1 C (98.8 F) . Physical examination is unremarkable. The patient's peripheral blood smear is shown on the image below. 
Which of the following is the most likely cause of this patient's symptoms?
Definitions:
Psychological Health
A state of well-being in which an individual realizes his or her own abilities, can cope with the normal stresses of life, can work productively, and is able to make a contribution to his or her community.
Social Action
An act undertaken with the intention of causing change in society or in particular social structures.
Posttraumatic Growth
Posttraumatic growth refers to positive psychological changes experienced as a result of struggling with highly challenging life circumstances.
Mental Health
The overall state of someone's emotional, psychological, and social well-being, influencing how they think, feel, and act.
Q92: A 34-year-old woman comes to the office
Q158: A 48-year-old man comes to the emergency
Q273: A 35-year-old man comes to the office
Q273: A 26-year-old Caucasian female is found to
Q285: A 68-year-old man comes to the office
Q291: A 50-year-old woman with a history of
Q314: A 46-year-old, previously healthy man develops sudden-onset,
Q421: A 45-year-old woman comes to the office
Q422: A 64-year-old man comes to the emergency
Q446: A 65-year-old woman is being evaluated following