a dull ache in + body part
ache 通常指持续性的隐痛，dull 常用来加强这一含义。
I have a dull ache in my lower back.
我下背部有持续的隐痛。
持续钝痛；隐痛
aches — plural of ache
心痛；感情上的痛苦；持续隐痛(区别于突发剧痛或痉挛性疼痛)；持续钝痛(通常中等程度)；情感痛苦(引起不适和身体疼痛)；疼痛
A continuous dull pain, usually moderate in intensity.
持续隐痛(区别于突发剧痛或痉挛性疼痛)
Continued dull pain, as distinguished from sudden twinges, or spasmodic pain.
持续钝痛(通常中等程度)
a dull persistent (usually moderately intense) pain
情感痛苦(引起不适和身体疼痛)
Emotional suffering causing discomfort and physical pain.
After staring at the computer screen for hours, I developed a dull ache in my neck.
盯着电脑屏幕几个小时后，我的脖子开始隐隐作痛。
用法提示：名词ache表示持续的隐痛，此处与in连用指定部位。
She couldn't sleep because of the ache in her tooth.
她因牙痛而无法入睡。
用法提示：名词ache前面有定冠词the，特指牙痛。
His back ache from lifting heavy boxes all day was relieved by a warm bath.
他整天搬运重箱子导致的背痛被热水澡缓解了。
用法提示：名词ache作为主语，后接was relieved，描述疼痛被缓解。
ache 通常指持续性的隐痛，dull 常用来加强这一含义。
I have a dull ache in my lower back.
我下背部有持续的隐痛。
固定短语，用复数，泛指身体各处的疼痛或不适。
After gardening, she had aches and pains all over.
园艺劳动后，她全身酸痛。
ache 可转指情感上的痛苦，常与 of 连用，后接抽象名词。
He felt the ache of loneliness after his wife died.
妻子去世后，他感到孤独的痛苦。
grammar · medium
易错句子I have ache in my back.
正确表达I have an ache in my back.
ache是可数名词，单数形式前必须加不定冠词a/an（或其它限定词）。汉语名词前没有冠词，中国学习者容易漏掉。
grammar · medium
易错句子I feel an ache on my back.
正确表达I feel an ache in my back.
表示身体部位内部的持续疼痛，介词用in，不用on；on表示接触表面，如“on my skin”。
grammar · medium
易错句子I have a stabbing ache in my side.
正确表达I have a stabbing pain in my side.
ache指持续性的钝痛，与stabbing（刀刺般的锐痛）语义矛盾；突发的锐痛应该用pain，不能用ache。
pain 泛指各种疼痛，包括突发的剧痛；ache 强调持续不退、程度中等的钝痛。指具体一次剧痛时用 pain，不用 ache。
sore 作名词指皮肤上因感染或摩擦而疼痛的局部（如疮、溃疡），是可数名词；ache 指体内持续的钝痛感，不指具体的伤口或疮面。
pang 指突然而短暂的一阵剧痛或情感刺痛，常与 of 连用（a pang of guilt）；ache 强调的是持续、缓慢不退的钝痛。
胃痛
I had a terrible stomach ache after eating too much.
我吃太多后胃痛得厉害。
头痛
She woke up with a splitting headache.
她醒来时头痛欲裂。
背痛
He suffers from chronic backache.
他患有慢性背痛。
牙痛
The toothache kept me awake all night.
牙痛让我整晚睡不着。
肌肉酸痛
After the workout, I had muscle aches all over.
锻炼后我全身肌肉酸痛。
隐痛
There was a dull ache in his lower back.
他的下背部有隐痛。
常与疼痛相关，表示轻微的不适感
常伴随酸痛出现，如肌肉僵硬
疼痛的常见原因，如关节炎
按压时产生的疼痛感
突然的肌肉收缩伴随疼痛
各种疼痛
After the workout, I had aches and pains all over.
锻炼后，我全身酸痛。
心痛
The breakup caused him a lot of heartache.
分手给他带来了很多心痛。
别告诉我的心，我那脆弱的心
From the 1992 country pop song 'Achy Breaky Heart' by Billy Ray Cyrus, which popularized line dancing.
出自1992年比利·雷·赛勒斯演唱的乡村流行歌曲《Achy Breaky Heart》，该歌曲推广了排舞文化。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.