Lado vs. flanco
When referring to the human torso, the main difference lies in specificity and register. Lado is the general, everyday term for a side of the body, while flanco is a specific anatomical term referring to the fleshy area between the ribs and the hip.
Lado
A1Lado is the most common and broad term used to describe the side of the body. It is used in informal and casual conversations to refer to the general left or right section of the torso or the position in which someone is lying.
Eu dormi do meu lado esquerdo a noite toda.
(I slept on my left side all night.)
Ela está sentindo uma dor no lado da barriga.
(She is feeling a pain in the side of her belly.)
O médico pediu para ele virar de lado.
(The doctor asked him to turn on his side.)
Ele tem uma cicatriz no lado direito do corpo.
(He has a scar on the right side of his body.)
Segure as mãos ao lado do corpo.
(Hold your hands by the side of your body.)
Flanco
C1Flanco is a more technical, anatomical, or literary word used to identify the specific region of the torso located between the lower ribs and the hip bone. It is frequently used in medical contexts or when describing detailed physical anatomy.
O paciente queixou-se de dor aguda no flanco direito.
(The patient complained of sharp pain in the right flank.)
Exercícios abdominais podem ajudar a definir os flancos.
(Abdominal exercises can help define the flanks.)
O lutador foi atingido duramente no flanco.
(The fighter was hit hard in the flank.)
A ultrassonografia examinou os rins através do flanco.
(The ultrasound examined the kidneys through the flank.)
Ele tinha um ferimento visível na região do flanco.
(He had a visible wound in the flank region.)
Summary
To summarize, use lado for almost all daily situations when talking about the right or left side of the body. Use flanco only when you need to be anatomically precise about the soft area between the ribs and the hips, such as in medical descriptions or fitness contexts.