Deep physical and mental suffering leaves an undeniable mark on the human body, stripping away a person's upright posture and casting a heavy shadow over their world. The primary approach among commentators is that severe illness and pain cause the body to lose its ability to stand straight, leaving a person bent, crooked, and unsteady. While most view this as a physical weakness, some add a more severe medical dimension, describing a state of cramping, spasms, and a loss of bodily control [רש"י]. Alongside this physical understanding, another perspective views this bent posture as a reflection of spiritual crookedness and sin. In this light, it is the weight of inner anxiety and deep feelings of guilt that ultimately crush a person and force them to bow down [אלשיך, מאירי].
This agony is entirely relentless, persisting throughout the entire day without a single moment of rest [רד"ק]. As a result, the sufferer falls into a dark state that blends both physical and emotional distress. Outwardly, the person's face physically changes and grows dark, looking as though it has been beaten by the harsh rays of the sun for a full day [אבן עזרא, רד"ק, מצודת ציון]. Inwardly, they walk through a thick darkness of troubles. They are consumed by sadness, anger, and a deep worry that seems to rot their very bones, an inner decay that becomes clearly visible on their face [אלשיך, מצודת דוד, ביאור שטיינזלץ]. The continuous act of walking in this state emphasizes that this is not a passing moment of hardship. Rather, it is an intense, ongoing, and powerful reality of moving through life wrapped in pain and gloom [רד"ק].