Sleep changes. In SIGECAPS, the S stands for disturbances in sleep, including insomnia (difficulty falling or staying asleep) or hypersomnia (sleeping too long). Sleep problems are common in depressive episodes and can worsen energy, concentration, and mood, making them a key symptom to track. The other aspects of SIGECAPS cover different areas—loss of interest, feelings of guilt, low energy, trouble concentrating, changes in appetite, psychomotor changes, and suicidal thoughts—so Sleep changes specifically identifies the sleep-related distress that often accompanies depression.

With mixed features means a mood episode shows symptoms from both poles: a manic or hypomanic mood plus depressive symptoms occurring within the same episode. The defining rule is that during a manic or hypomanic episode, at least three depressive symptoms must be present for the specifier to be applied. These depressive symptoms include things like depressed mood, diminished interest, fatigue, feelings of worthlessness or guilt, concentration difficulties, psychomotor changes, or thoughts of death. So the statement that best describes the specifier is that, during a manic or hypomanic episode, at least three depressive symptoms are present. This captures the idea of a mixed picture within the same episode. The other options either describe depressive episodes with manic symptoms, imply exclusion of depressive symptoms, or refer to psychotic features, which are separate considerations rather than the mixed-features construct.

In acute mania, the goal is to rapidly calm the elevated mood, reduce risk behaviors, address any psychotic symptoms, and keep the person safe. A first-line approach combines a mood stabilizer with an antipsychotic. The mood stabilizer helps normalize the mood state and prevent cycling, with lithium, valproate, or carbamazepine chosen based on the clinical profile and any medical considerations. The antipsychotic provides faster relief of core manic symptoms such as grandiosity, pressured speech, and agitation, and can also treat any concurrent psychotic features. If the agitation or insomnia is prominent, a benzodiazepine may be added briefly to help sedation and sleep while the other meds take effect. Nonpharmacologic safety planning supports these medical steps by addressing immediate safety concerns, ensuring a stable environment, and coordinating care with support networks. Relying on antidepressants alone is not appropriate here because they can trigger or worsen a manic episode. Psychotherapy without medication typically cannot quickly control the acute, severe SAMPLEsymptoms of mania. Sedatives used alone do not stabilize mood or treat the underlying manic state. The combination of a mood stabilizer, an antipsychotic, and short-term benzodiazepine for agitation, plus safety planning, targets both the mood disturbance and safety needs of an acute manic episode.

Bipolar disorder is defined by mood episodes that alternate between depression and mania or hypomania. These episodes bring noticeable changes in energy, activity, sleep, and behavior and tend to recur over time. The defining feature is this pattern of distinct mood states, rather than persistent anxiety, psychosis, or sleep problems alone. Anxiety disorders center on fear and panic; psychotic disorders focus on delusions or false beliefs (which can occur during mood episodes but are not the defining pattern for bipolar); sleep disorders involve sleep issues rather than the mood-shift pattern that characterizes bipolar. Therefore, describing bipolar as a mood disorder with episodes of depression and mania or hypomania best matches its clinical definition.

Lithium’s potential neuroprotective effects are a meaningful long-term benefit of mood stabilization in bipolar disorder. Research suggests lithium helps support brain health by boosting neurotrophic factors like BDNF, promoting neurogenesis and synaptic plasticity, and helping preserve gray matter. These changes can contribute to greater brain resilience, a lower risk of mood-episode recurrence, and may be linked to reduced suicide risk over time. This isn’t an immediate cure for mania, and lithium can have adverse effects such as thyroid changes, which aren’t benefits. It also tends to stabilize mood rather than cause rapid cycling.